Question

The students _____(not leave) the exam hall before

2pm.​

Answer 1

Answer:

The students must not leave the exam hall before 2pm.

Explanation:

Hope this helps you!✨

Answer 2

Answer:

The students must not leave the exam hall before 2 p.m.

Explanation:

We use must not to say that something is not permitted or allowed.

You should not means something like I think it is a bad idea for you to do it. Should is used to express the opinion of a speaker and often follows I think or I don't think.

So dont use should not for the sentence.

Hope it helps!