He can speak Chinese.
She should be here by 9:00.
He should not be late.
They might not come to the party.
錯誤：He will can go with us.
錯誤：She musted study very hard.
Can, could, may, might, will, would, must, shall, should, ought to
You must stop when the traffic lights turn red.
You should see the doctor.
There are a lot of tomatoes in the fridge. You need not buy any.
You ought to go to the doctor.
It’s snowing, so it must be very cold outside.
I don’t know where John is. He could have missed the train.
This bill can’t be right. £200 for two cups of coffee!
She can speak six languages.
My grandfather could play golf very well.
I can’t drive.
Children must do their homework.
We haveto wear a uniform at work.
You should stop smoking.
Could I leave early today, please?
You may not use the car tonight.
Can we swim in the lake?
When I lived in Italy, we would often eat in the restaurant next to my flat.
John will always be late!
|to have to||100% obligation||I must stop when the traffic lights turn red.|
|to be very probable||logical conclusion (deduction)||He must be very tired after such enormous work.|
|not to be allowed to||prohibition||You must not smoke in the hospital.|
|to be able to||ability||I can swim.|
|to be allowed to||permission||Can I use your phone please?|
|it is possible||possibility||Smoking can cause cancer!|
|to be able to||ability in the past||When I was younger I could stay up all night and not get tired.|
|to be allowed to||more polite permission||Excuse me, could I just say something?|
|it is possible||possibility||It could rain tomorrow!|
|to be allowed to||permission||May I use your phone please?|
|it is possible, probable||possibility, probability||It may rain tomorrow!|
|to be allowed to||more polite permission||Might I use your phone please?|
|it is possible, probable||weak possibility, probability||I might come and visit you in America next year, if I can save enough money.|
|necessary||necessity||Need I say more?|
|not necessary||lack of necessity/absence of obligation||I need not buy any tomatoes. There are plenty in the fridge.|
|used to say or ask what is the correct or best thing to do||50% obligation||I should/ought to see a doctor. I have a terrible headache.|
|to suggest an action or to show that it is necessary||advice||You should / ought to revise your lessons.|
|to be very probable||logical conclusion (deduction)||He should / ought to be very tired after such enormous work.|
|to suggest an action or to show that it is necessary||advice||You’d better revise your lessons.|