A2 used to show that it is necessary or very important that something happens in the present or future必须
If you say that you must do something, you mean that you strongly intend to do something in the future.一定要,坚持要
used for emphasis(表示强调)必须
B1 If you tell someone else that they must do something pleasant, you are emphasizing that you think it is a good idea to do that.务必,一定要
More examples
I must do some ironing tonight.
Food must be heated to a high temperature to kill harmful bacteria.
You must give the bank a written notification if you wish to close your account.
Soldiers must obey orders.
Candidates must answer two questions from each paper.
B2 used to show that something is very likely, probable, or certain to be true想必;一定
More examples
There must be a phone directory in the office somewhere.
There's water on the floor - we must have a leak.
Try to imagine what life must have been like for Neolithic man 10,000 years ago.
The letter must have gone astray in the post.
Why am I under arrest? There must be some mistake.
something that is necessary必不可少的事物
something that is so good, you must do it, have it, or see it必须要做/有/看的
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