How do we use the modal verb "must"?

[amna]

what is the difference b/w using must in sentences like this

U must not drop this.

U must do it correctly.

her english is good, she must speal it often.

pl explain it with example, I am confuse about it.

Amna[/b]

[Sunny]

I can only help you with the expressions 'to have to' and 'to be allowed to'

You must do it correctly means 'You have to do it correctly'. It is the expression of a kind of duty.

If one tells you 'You must not smoke here', it means that you are not allowed to do this. It is something forbidden.

I hope, I did not confuse you.

[Mister Micawber]

.
What does 'b/w' mean?
What does 'U' mean?

It is difficult to help posters who do not try to use proper English-- we cannot pinpoint the problem.

.
_________________
Native English teacher at Mister Micawber's

[Guest]

I guess b/ w stands for between and U for You.

[Mister Micawber]

.
Since this is an English language forum, let us spell 'between' as 'between' and 'you' as 'you', shall we? Then I can better assess enquirers' language cognizance.

.
_________________
Native English teacher at Mister Micawber's