You mustn’t hurry. (= It’s necessary that you don’t hurry. I order you not to hurry.)

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Typical mistakes

1.Она должно быть очень страдает. She must suffer a lot.*

Correct: She must be suffering a lot.

2.Он, должно быть, ничего не знает. He mustn’t know anything.*

Correct: He must know nothing.

3. Она, должно быть, не записала ваш адрес. She must not have written your address.*

Correct: She can't have written / must have failed to write down your address.

4.Она, скорее всего, придет через десять минут. She must come in ten minutes.*

Correct: She’ll probably come in ten minutes.

2.  to express a rule or regulation about things which are absolutely necessary to do or not to do (also in formal written notices):

When you drive you must stop at a red light and mustn’t overtake on a bend.

This door must not be left open (a formal written notice).

3. to express obligation from the speaker’s point of view. In affirmative     sentences it implies order:

You must talk to your daughter about her future (The speaker personally feels that it’s necessary to do, it implies order).

Must he do it? (= Do you personally think it’s necessary for him to do it?)

I must work hard to pass the exam (I personally think it’s necessary for me).

4. to express prohibition (in negative sentences):

You mustn’t tell anyone what I said (= It’s necessary that you do not tell anyone).

Note 1. Must is not used to express absence of necessity. Someone need not/ doesn’t need to/ doesn’t have to do can be used instead (see Need 1, Have to 1):

You don’t need to tell anyone the news. I’ve just done it myself.

Comparewith can, may (see Can. 4, May. 1):

You must not do smth.

from the speaker’s point of view it’s necessary:

You must not be late for the interview. It’s your only opportunity to get the job.

You cannot do smth.

it’s prohibited due to generally accepted rules:

You cannot be late for classes.

You may not do smth.

the speaker doesn’t allow smth.:

You may not be late for dinner today. Do not ask me about it.

5. to give emphatic advice (the meaning of obligation is weakened):

You must come and see us when you are in London.

You mustn’t miss the film. It’s very good.

6. in set-phrases:

I must be going/ be off. = Мне пора.

I must tell you that…

You must admit.

NEED

can be used as a defective verb (esp. in negative sentences):

You needn’t do it.

and as a regular verb (esp. in American English):

You don’t need to do it.

We use need:

1. to express necessity (the meaning is rare) / absence of necessity

You needn’t hurry. You’ve got plenty of time. (= It’s not necessary for you to hurry.)

Comparewith mustn’t (see Must 4):

Note 1. needn’t have donemeans that someone did something not  knowing that it wasn’t necessary, it was a waste of time / effort:

Tom wanted to catch a train. He left home late, so he hurried to the station. But the train was also late – it didn’t leave until 20 minutes after Tom arrived at the station. So Tom needn’t have hurried but he did it as he didn’t know that the train would be late. (= Том спешил зря.)

Note 2. didn’t need tois different from needn’t have done,it means that    an action was unnecessary  and it was known at the time of the action:

I didn’t need to go there but I decided to go anyway. (= Мне не нужно было идти туда.)

2. to express permission not to do something (the speaker gives authority for the non-performance of the action) (compare with Can 4, May 1):

Shall I type this letter now? – No, you needn’t. You can do it later.

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