Question

Is it possible to substitute the verb CAN for the verb MUST? Explain the difference between the meaning of can and must

Answer 1

Resposta:

can is a permission and must obligation, so, no, it's not possible.

We often use can to ask for and give permission.

Can I sit here?

You can use my car if you like.

Can I make a suggestion?

Must expresses a strong obligation or necessity. It often shows us that the obligation comes from the speaker

(Teacher to student) You must hand in your homework on Tuesday or you will lose ten per cent of your mark.

(Sign on a plane) Seat belts must be worn by all passengers.