Question

Where should not is used?

Where must not is used?

Give some examples.

Answer 1

Here is your answer

"Shouldn't" is used to suggest that it is not correct to do something.

Example :You should not tease animals.

"Must not " suggest a compulsion/obligation not to do something. It is simply a prohibition to do something

Example: You must not drink this water. It's contaminated.

Hope this is helpful.....

Answer 2

Hey!

“should” and “must” are both modals.Both “should” and “must” are similar in meaning except that “must” is a much stronger word as compared to “should.”

Some examples-

Should not-
*She shouldn't have blamed him last night.
*He shouldn't question what to do.
*I shouldn't have come out here.
*It shouldn't be hard to dig.

Must not-
*You mustn’t shout in the library.
*She mustm't forget her books.
*You mustn’t be late for class.
*I mustn't make a mess.
Hope it helps.