日常で「これはあれより大きい」とか「これが一番美味しい」とか、比べて話すことってよくあるよね。英語でもこうした比較を表現する方法があって、比較級と最上級っていうんだ。テストにも絶対出るし、会話でもめちゃくちゃ使えるから、今回でマスターしちゃおう！
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Updated Mar 31, 2026
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もっと詳しく学ぶ比較級と最上級の使い方
1 / 5
比較級・最上級の基本とルール
英語で何かを比べるときは、主に3つのパターンがあるよ。原級（同じくらい）、比較級（〜より）、最上級（一番）の3つだ。
覚えるポイントは、比較級にはthan、最上級にはtheがつくこと。これを忘れるとテストでバツになっちゃうから注意して。
形容詞や副詞の変化も大事。短い単語は語尾に-erや-estをつけて、長い単語はmoreやmostを前につける。このルールを覚えれば、もう怖くない！
覚えよう！ 比較級=than、最上級=the これだけでも点数アップ間違いなし
比較級の作り方と使い方
比較級は2つのものを比べるときに使うよ。「AはBより〜だ」っていう感じ。
短い単語（1〜2音節）は語尾に**-erをつける。tall → taller、fast → fasterみたいに。長い単語（3音節以上）は前にmore**をつけるだけ。beautiful → more beautifulって具合だね。
不規則変化もあるから要注意。good → better、bad → worse、many/much → moreは絶対覚えて。文の形は「A + be動詞 + 比較級 + than + B」。Ken is taller than Tom.みたいに使うよ。
スペル変化にも気をつけて。big → bigger（子音を重ねる）、easy → easier（yをiに変える）、large → larger（eで終わるときはrだけ）。
要チェック！ famous は短いけどmore famousになるよ。例外もあるから注意
最上級と原級の使い方
最上級は3つ以上の中で「一番」を決めるときに使う。作り方は比較級と似てて、短い単語は-est、長い単語はmostをつけるだけ。
文の形は「A + be動詞 + the + 最上級 + in/of + B」。inは場所や範囲（in my class, in Japan）、ofは具体的な数（of the three, of all students）で使い分けよう。
原級は「〜と同じくらい」を表す。as + 形容詞/副詞の原級 + asの形で、Ken is as tall as Tom.って感じ。否定文のnot as... asは「〜ほど...ではない」って意味になって、これは比較級への書き換え問題でよく出るから覚えておこう。
ポイント！ 最上級のtheを忘れたり、asとasの間にtallerみたいな比較級を入れるのは絶対NG
実践練習と間違えやすいポイント
例文で練習してみよう。oldを使うと、「My sister is as old as you（姉はあなたと同い年）」「My grandfather is older than my grandmother（祖父は祖母より年上）」「My grandfather is the oldest in my family（祖父が家族で一番年上）」みたいになる。
goodの不規則変化も要チェック。good → better → bestで、「I can't play tennis as well as Emi（エミほどテニスが上手じゃない）」「She is the best tennis player in our school（彼女が学校一のテニス選手）」って使えるよ。
テストでよくある間違いは、最上級のthe忘れ、比較級のthan忘れ、more tallerみたいな二重表現。あと、as taller asみたいにasの間に比較級を入れるのもダメ。
テスト対策！ good-better-best、bad-worse-worstの不規則変化は暗記必須
まとめ：これだけは絶対覚えよう
比較級は2つを比べて「-er than」か「more...than」。最上級は3つ以上で一番を決めて「the -est」か「the most...」。原級は同じくらいで「as...as」。
不規則変化のgood-better-best、bad-worse-worst、many/much-more-mostは必須暗記。スペル変化のルール（y→i、子音を重ねる、eで終わるときはrだけ）も忘れずに。
否定の原級「not as...as」は「〜ほど...ではない」で、比較級との書き換えでよく出題される。この基本パターンを頭に入れて、いろんな単語で練習すれば完璧だ！
最終確認！ 比較級=than、最上級=the、原級=as...as この3つの組み合わせを間違えなければOK
We thought you’d never ask...
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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.
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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
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Best app on earth! no words because it’s too good
Thomas R
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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
もっと詳しく学ぶ比較級と最上級の使い方
日常で「これはあれより大きい」とか「これが一番美味しい」とか、比べて話すことってよくあるよね。英語でもこうした比較を表現する方法があって、比較級と最上級っていうんだ。テストにも絶対出るし、会話でもめちゃくちゃ使えるから、今回でマスターしちゃおう！
比較級・最上級の基本とルール
英語で何かを比べるときは、主に3つのパターンがあるよ。原級（同じくらい）、比較級（〜より）、最上級（一番）の3つだ。
覚えるポイントは、比較級にはthan、最上級にはtheがつくこと。これを忘れるとテストでバツになっちゃうから注意して。
形容詞や副詞の変化も大事。短い単語は語尾に-erや-estをつけて、長い単語はmoreやmostを前につける。このルールを覚えれば、もう怖くない！
覚えよう！ 比較級=than、最上級=the これだけでも点数アップ間違いなし
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比較級の作り方と使い方
比較級は2つのものを比べるときに使うよ。「AはBより〜だ」っていう感じ。
短い単語（1〜2音節）は語尾に**-erをつける。tall → taller、fast → fasterみたいに。長い単語（3音節以上）は前にmore**をつけるだけ。beautiful → more beautifulって具合だね。
不規則変化もあるから要注意。good → better、bad → worse、many/much → moreは絶対覚えて。文の形は「A + be動詞 + 比較級 + than + B」。Ken is taller than Tom.みたいに使うよ。
スペル変化にも気をつけて。big → bigger（子音を重ねる）、easy → easier（yをiに変える）、large → larger（eで終わるときはrだけ）。
要チェック！ famous は短いけどmore famousになるよ。例外もあるから注意
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最上級と原級の使い方
最上級は3つ以上の中で「一番」を決めるときに使う。作り方は比較級と似てて、短い単語は-est、長い単語はmostをつけるだけ。
文の形は「A + be動詞 + the + 最上級 + in/of + B」。inは場所や範囲（in my class, in Japan）、ofは具体的な数（of the three, of all students）で使い分けよう。
原級は「〜と同じくらい」を表す。as + 形容詞/副詞の原級 + asの形で、Ken is as tall as Tom.って感じ。否定文のnot as... asは「〜ほど...ではない」って意味になって、これは比較級への書き換え問題でよく出るから覚えておこう。
ポイント！ 最上級のtheを忘れたり、asとasの間にtallerみたいな比較級を入れるのは絶対NG
Sign up to see the contentIt's free!
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実践練習と間違えやすいポイント
例文で練習してみよう。oldを使うと、「My sister is as old as you（姉はあなたと同い年）」「My grandfather is older than my grandmother（祖父は祖母より年上）」「My grandfather is the oldest in my family（祖父が家族で一番年上）」みたいになる。
goodの不規則変化も要チェック。good → better → bestで、「I can't play tennis as well as Emi（エミほどテニスが上手じゃない）」「She is the best tennis player in our school（彼女が学校一のテニス選手）」って使えるよ。
テストでよくある間違いは、最上級のthe忘れ、比較級のthan忘れ、more tallerみたいな二重表現。あと、as taller asみたいにasの間に比較級を入れるのもダメ。
テスト対策！ good-better-best、bad-worse-worstの不規則変化は暗記必須
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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まとめ：これだけは絶対覚えよう
比較級は2つを比べて「-er than」か「more...than」。最上級は3つ以上で一番を決めて「the -est」か「the most...」。原級は同じくらいで「as...as」。
不規則変化のgood-better-best、bad-worse-worst、many/much-more-mostは必須暗記。スペル変化のルール（y→i、子音を重ねる、eで終わるときはrだけ）も忘れずに。
否定の原級「not as...as」は「〜ほど...ではない」で、比較級との書き換えでよく出題される。この基本パターンを頭に入れて、いろんな単語で練習すれば完璧だ！
最終確認！ 比較級=than、最上級=the、原級=as...as この3つの組み合わせを間違えなければOK
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
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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4.7/5
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