// 情态动词
You can park your car here. // 允许 语气
You must park your car here. // 禁止 语气比较严厉
You'd better park you here. // 劝告
语气 推测 虚拟
can/could may/might must
Can VS be able to
I can speak English but I can't speak Spanish.
Despite his handicap he is able to drive.
He managed to get on train without a ticket.
Can : 表示能力 be able to 表示一种能力
// 表示请求或者可能
Can he have said so?
Can it be true.
Can it be true?
Could you lend me some money?
What he said could be true, but i still doubt it.
I could do the job today, but i rather put it off until tomorrow.
What he said could be true, but i still doubt it. // 轻微怀疑
i could do the job today, but i'd rather put it off untill tomorrow. //
必备惯用语: can't .... to 在怎么样也不为过.....
I can't thank you too much.
I can't see you too often.
You can never be too carefull when you cross the road.
can't
I can't help laughing// 情不自禁做某事..... can't help doing ======can't help onself.
I can't help to repair you bike// can't can't help to do............
I just can't help it. can't help it.
One cannot succeed without perseverance
Man cannot live without air.
He may konw the truth.
He may be waiting for you right now.
They may have got lost.
May I use your pen ?
May I smoke here?
maybe 副词
may be 系动词 系表结构
may > might He/may might be very busy now.
May she come this afternoon?// be likely to do
Do you think
may well to He has changed so much. You may well not recognize him.
may/might as well do You may/might as well stay at home tonight.
may/ might as well do A as do B You may/might as well throw the money away sa lend it to him.
May you succeed.
Come what may, i will never betray you.
You must arrive in time. 必须
You musnt't do (不准)park car here. 不准
You must be Eva. 一定
All men must die. 必然会
Warm clothes are a must(必须) in the moutains.
Must I finish the work today? Yes, you must.
No, you needn't.
No, you don't have to.
have to 和 must 区别
// have to 客观的需要 不得不照顾
My brother was very ill, so I had to look after him.
I had to work when i was your age.
have 有时态变化 don't have to 不必
must 主观
You must get your work done by this Friday.
must 没有时态变化 musn't do: 不准做....事情