---No, you mustn’t.
I think he can’t be present on time.
We can’t finish so much work in a day.
4) must 可表示一种推测。
A. 对目前情况的推测
Mr. Li must be at home.
B. 对过去情况的判断
He has been away for two hours. He must have got there.
5) 有时有“偏偏,偏要”的意思。
Why must it rain today?
When I was taking a nap, a student must knock at the door.
5. need
1) 作情态动词,后跟动词原形,主要用于否定句及疑问句。
It’s so early. You needn’t hurry.
You needn’t let him know this.
Need I go with you? No, you needn’t.
Need I come? Yes, you must.
2) 作及物动词,有人称、数和时态的变化。
A: sb + need + (to do) sth.
He needed a room to live in.
He needs to do it alone. = He need do it alone.
They didn’t need to do it yourself.
You need to learn more. = You need learn more.
B: sth + need + doing / to be done
My watch doesn’t work. It needs repairing.
The question you raised needs to be discussed.
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