- Immediate obligation or
necessity, or an obligation referring to the future/in the
We must begin before 5p.m.
He must move the furniture
- Prohibition, negative
commands/only in the negative sentences/.
The little girl must nit go home
You must not do it!
- Probability, near certainty
about the present and the past/only in statements
He must be crazy.
She must be so lonely!
Did you always live with Bob?
You must have led a quiet life!
In these sentences
"Must" has the same meaning as: Probably, Evidently.
- Obligation referring to the
present or future in the reported speech
He said we must invite her to
You must come and see me
You must come and have dinner
- If we use the perfect
Progressive infinitive, it indicates the process in the past
It must have been raining when