Can 是英文最常用的語氣助動詞之一，它可用來表示能力、機會、請求、允許或可能性。
例句：
- I can drive a tourist bus. (我會開遊覽車) － 能力
- We can stay with my brother-in-law when we are in Tokyo. (我們在東京時可以住在我姊夫家裡) － 機會
- Mary cannot stay out after 10 PM. (晚上十點過後，瑪麗就不可以在外逗留) － 允許
- Can you pass me the salt? (你可以把鹽巴遞給我嗎？) － 請求
- Any child can grow up to be president. (任何小孩長大後都有可能成為總統) － 可能性
Can 的現在、過去和未來時態用法
大多數語氣助動詞的過去和未來時態都相當不規則。下表為 can 在不同上下文中的用法說明。
| Can 的用法 | 肯定句 | 否定句 | 你也可以用 |
| 一般能力 | 現在：I can speak Korean. (我會說韓文) 過去：Can 變成 could I could speak Korean when I was a child. (小時候我會說韓文) 未來：Can 變成 be able to I will be able to speak Korean after I come back from South Korea. (我從南韓回來後就會說韓文了) |
現在：I can't speak Korean. (我不會說韓文) 過去：Can 變成 could I couldn't speak Korean when I was a child. (小時候我不會說韓文) 未來：Can 變成 be able to I still won't be able to speak Korean after I come back from South Korea. (我從南韓回來後還是不會說韓文) |
be able to |
| 特定能力 (短暫或一時的能力) | 現在：In an emergency, some people can jump over a high wall. (緊急時，有些人能跳過高牆) 過去：Can 變成 be able to In an emergency, some people were able to jump over a high wall. (緊急時，有些人能跳過高牆) 未來：Can 變成 be able to In an emergency, some people will be able to jump over a high wall. (緊急時，有些人能跳過高牆) |
現在：Even in an emergency, some people still can't jump over a high wall. (即使在緊急時，有些人還是不能跳過高牆) 過去：Can 變成 be able to Even in an emergency, some people still weren't able to jump over a high wall. (即使在緊急時，有些人還是不能跳過高牆) 未來：Can 變成 be able to Even in an emergency, some people still won't be able to jump over a high wall. (即使在緊急時，有些人還是不能跳過高牆) |
be able to |
| 機會 | 現在：I have some free time. I can teach you English conversation now. (我有一些空閒時間。現在我可以教你英文會話) 過去：Can 變成 be able to I had some free time yesterday. I was able to teach you English conversation at that time. (昨天我有一些空閒時間。當時我可以教你英文會話) 未來：I'll have some free time tomorrow. I can teach you English conversation then. (明天我有一些空閒時間。屆時我可以教你英文會話) |
現在：I don't have any time. I can't teach you English conversation now. (我沒有任何時間。現在我不能教你英文會話) 過去：Can 變成 be able to I didn't have time yesterday. I wasn't able to teach you English conversation at that time. (昨天我沒有時間。當時我不能教你英文會話) 未來：I won't have any time tomorrow. I can't teach you English conversation then. (明天我沒有任何時間。屆時我不能教你英文會話) |
be able to |
| 允許 | 現在：Kevin can drive my car when I take a business trip to China. (我到中國出差時，凱文可以開我的車) 過去：Can 變成 be allowed to Kevin was allowed to drive my car while I took a business trip to China last week. (上週我到中國出差時，我允許凱文開我的車) 未來：Kevin can drive my car while I take a business trip to China next week. (下週我到中國出差時，凱文可以開我的車) |
現在：Kevin can't drive my car when I take a business trip to China. (我到中國出差時，凱文不許開我的車) 過去：Can 變成 be allowed to Kevin wasn't allowed to drive my car while I took a business trip to China last week. (上週我到中國出差時，我不允許凱文開我的車) 未來：Kevin can't drive my car while I take a business trip to China next week. (下週我到中國出差時，凱文不許開我的車) |
may |
| 請求 | Can I have a cup of coffee please? (可以給我一杯咖啡嗎？) Can you help me with my homework? (你能教我做功課嗎？) 請求通常指不久的將來。 |
Can't I have a cup of coffee? (能不能給我一杯咖啡呢？) Can't you help me with my homework? (你不能教我做功課嗎？) 請求通常指不久的將來。 |
could, may |
| 可能性 | You can become very rich if you work 18 hours every day. (如果你每天工作 18 小時，你可能變得非常有錢) Eating too much can shorten your life. (吃太多可能縮短壽命) 這項用法通常是一種概括性的假定或推測。 |
He can't be your classmate. I think he is your teacher. (他不可能是你的同班同學。我以為他是你的老師) Helen can't be 40! I thought she was about 20 years old. (海倫不可能 40 歲！我以為她大約 20 歲左右) 這項用法通常是一種概括性的假定或推測。 |
could
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文章連結：http://englishhome.org/learning-grammar_contents/
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