不定詞と動名詞って、どちらも「〜すること」って訳せるから混乱しがちだよね。でも実は、動詞によってどちらを使うかが決まってるし、使い方次第で意味も変わるんだ。この違いを理解すれば、テストでも確実に点が取れるようになるよ!
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Updated Apr 21, 2026
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不定詞と動名詞って、どちらも「〜すること」って訳せるから混乱しがちだよね。でも実は、動詞によってどちらを使うかが決まってるし、使い方次第で意味も変わるんだ。この違いを理解すれば、テストでも確実に点が取れるようになるよ!






**不定詞(to + 動詞の原形)**は「未来志向」のイメージを持ってる。これからやりたいことや、まだ実現していないことを表すことが多いんだ。例えば「I want to visit Kyoto.」は、これから京都に行きたいという気持ちを表してるよね。
一方、**動名詞(動詞のing形)**は「過去志向・反復・事実」のイメージ。すでにやったことや、習慣的にしていること、一般的な事実を指すことが多い。「I enjoy watching movies.」なら、映画を観るという行為そのものを楽しんでいるってことだ。
この「未来志向」と「過去志向」のイメージを覚えておけば、どの動詞がどちらを好むかが理解しやすくなるよ。覚えることは多いけど、パターンが見えてくれば大丈夫!
💡 ポイント: 不定詞は「これから」、動名詞は「すでに」というイメージで覚えよう!

不定詞(to do)のみをとる動詞は、未来のことや意志・決意を表すものが多い。want to do(〜したい)、decide to do(〜すると決める)、promise to do(〜すると約束する)、plan to do(〜する計画を立てる)などがその代表例だ。
動名詞(doing)のみをとる動詞は、反復・中断・完了・回避などを表すものが中心。enjoy doing(〜して楽しむ)、finish doing(〜し終える)、stop doing(〜するのをやめる)、avoid doing(〜するのを避ける)などは絶対に覚えておこう。
「Would you mind opening the window?」のように、mind doingは「〜するのを嫌がる」という意味で、丁寧な依頼でよく使われるから要チェックだ。
💡 ポイント: enjoy, finish, stopなどの頻出動詞は動名詞とセットで覚えよう!

ここがテストで一番狙われるポイント!remember, forget, try, stopは不定詞と動名詞で意味が大きく変わるんだ。
remember to doは「これから〜することを覚えている」、remember doingは「過去に〜したことを覚えている」。「Remember to lock the door.」(ドアに鍵をかけるのを忘れないで)と「I remember seeing him before.」(以前彼に会ったのを覚えてる)では全然違うよね。
try to doは「〜しようと努力する」、try doingは「試しに〜してみる」。前者は頑張ったけどできなかった場合が多く、後者は実際にやってみたという意味になる。
stop to doは「〜するために立ち止まる」(目的)、stop doingは「〜することをやめる」(中断)。この違いは文の構造も違うから特に注意が必要だ。
💡 ポイント: remember, forget, try, stopは例文とセットで覚えると間違えない!

実際の問題を解いてみよう。「()にstudyを適切な形で入れる」問題で考え方をチェックだ。
「I hope () abroad in the future.」なら、hopeは未来志向の動詞だからto studyが正解。「My brother gave up () to be a doctor.」は、give upが動名詞をとる動詞なのでstudyingになる。
「Please remember () for the test tomorrow.」は「明日の」テストのために「これから」勉強することだからto study。「I remember () with him last year.」は「去年」という過去のことを覚えているからstudyingが答えだ。
このように、動詞の性質と時制のイメージを組み合わせて考えれば、迷わずに答えが出せるようになるよ。
💡 ポイント: 時を表す語句(tomorrow, last year)も判断の手がかりにしよう!

前置詞の後ろは必ず動名詞というルールは絶対に覚えておこう。「I'm looking forward to seeing you.」のtoは前置詞だから、後ろには動名詞のseeingが来るんだ。不定詞のtoと前置詞のtoを見分けるのがポイントだよ。
使役動詞・知覚動詞の後ろでは原形不定詞(toなし)を使う。「My mother made me clean my room.」「I saw him cross the street.」のように、make, have, let(使役)やsee, hear, feel(知覚)の後ではtoをつけないから注意しよう。
テスト前の最終確認として、不定詞は「未来・これから」、動名詞は「過去・習慣・事実」、意味が変わる4つの動詞(remember, forget, try, stop)、前置詞+動名詞、使役・知覚動詞+原形不定詞を必ずチェックしておこう。
💡 ポイント: 前置詞のtoと不定詞のtoの違いを見極められれば、ミスが大幅に減る!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
不定詞と動名詞って、どちらも「〜すること」って訳せるから混乱しがちだよね。でも実は、動詞によってどちらを使うかが決まってるし、使い方次第で意味も変わるんだ。この違いを理解すれば、テストでも確実に点が取れるようになるよ!

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**不定詞(to + 動詞の原形)**は「未来志向」のイメージを持ってる。これからやりたいことや、まだ実現していないことを表すことが多いんだ。例えば「I want to visit Kyoto.」は、これから京都に行きたいという気持ちを表してるよね。
一方、**動名詞(動詞のing形)**は「過去志向・反復・事実」のイメージ。すでにやったことや、習慣的にしていること、一般的な事実を指すことが多い。「I enjoy watching movies.」なら、映画を観るという行為そのものを楽しんでいるってことだ。
この「未来志向」と「過去志向」のイメージを覚えておけば、どの動詞がどちらを好むかが理解しやすくなるよ。覚えることは多いけど、パターンが見えてくれば大丈夫!
💡 ポイント: 不定詞は「これから」、動名詞は「すでに」というイメージで覚えよう!

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不定詞(to do)のみをとる動詞は、未来のことや意志・決意を表すものが多い。want to do(〜したい)、decide to do(〜すると決める)、promise to do(〜すると約束する)、plan to do(〜する計画を立てる)などがその代表例だ。
動名詞(doing)のみをとる動詞は、反復・中断・完了・回避などを表すものが中心。enjoy doing(〜して楽しむ)、finish doing(〜し終える)、stop doing(〜するのをやめる)、avoid doing(〜するのを避ける)などは絶対に覚えておこう。
「Would you mind opening the window?」のように、mind doingは「〜するのを嫌がる」という意味で、丁寧な依頼でよく使われるから要チェックだ。
💡 ポイント: enjoy, finish, stopなどの頻出動詞は動名詞とセットで覚えよう!

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Improve your grades
Join milions of students
ここがテストで一番狙われるポイント!remember, forget, try, stopは不定詞と動名詞で意味が大きく変わるんだ。
remember to doは「これから〜することを覚えている」、remember doingは「過去に〜したことを覚えている」。「Remember to lock the door.」(ドアに鍵をかけるのを忘れないで)と「I remember seeing him before.」(以前彼に会ったのを覚えてる)では全然違うよね。
try to doは「〜しようと努力する」、try doingは「試しに〜してみる」。前者は頑張ったけどできなかった場合が多く、後者は実際にやってみたという意味になる。
stop to doは「〜するために立ち止まる」(目的)、stop doingは「〜することをやめる」(中断)。この違いは文の構造も違うから特に注意が必要だ。
💡 ポイント: remember, forget, try, stopは例文とセットで覚えると間違えない!

Access to all documents
Improve your grades
Join milions of students
実際の問題を解いてみよう。「()にstudyを適切な形で入れる」問題で考え方をチェックだ。
「I hope () abroad in the future.」なら、hopeは未来志向の動詞だからto studyが正解。「My brother gave up () to be a doctor.」は、give upが動名詞をとる動詞なのでstudyingになる。
「Please remember () for the test tomorrow.」は「明日の」テストのために「これから」勉強することだからto study。「I remember () with him last year.」は「去年」という過去のことを覚えているからstudyingが答えだ。
このように、動詞の性質と時制のイメージを組み合わせて考えれば、迷わずに答えが出せるようになるよ。
💡 ポイント: 時を表す語句(tomorrow, last year)も判断の手がかりにしよう!

Access to all documents
Improve your grades
Join milions of students
前置詞の後ろは必ず動名詞というルールは絶対に覚えておこう。「I'm looking forward to seeing you.」のtoは前置詞だから、後ろには動名詞のseeingが来るんだ。不定詞のtoと前置詞のtoを見分けるのがポイントだよ。
使役動詞・知覚動詞の後ろでは原形不定詞(toなし)を使う。「My mother made me clean my room.」「I saw him cross the street.」のように、make, have, let(使役)やsee, hear, feel(知覚)の後ではtoをつけないから注意しよう。
テスト前の最終確認として、不定詞は「未来・これから」、動名詞は「過去・習慣・事実」、意味が変わる4つの動詞(remember, forget, try, stop)、前置詞+動名詞、使役・知覚動詞+原形不定詞を必ずチェックしておこう。
💡 ポイント: 前置詞のtoと不定詞のtoの違いを見極められれば、ミスが大幅に減る!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user