Soluzione del esercizio 1 di Performer B1 Phases, Vol. 1

MUST

FORM

It is a modal verb, so it is invariable and always followed by the base form of the main verb.

It is used only in the present simple form. In all other tenses it is substituted by have to

USE

To talk about a strong personal obligation or necessity.

Example:

• I must learn German; I think it's important.

To give direct orders (orally or in written instructions and formal notices).

Example:

• You must finish your homework before dinner.

Students must wear school uniforms at all times.

To express strong recommendation.

Example:

• You must see the doctor: you look very sick

HAVE TO

It isn't a modal verb, so it follows the rules of the verb have.

USE

To talk about an external obligation (imposed by laws, regulations, other people).

Example:

• In most primary schools, children have to wear a uniform.

To report other people's orders or instructions.

Example:

• My boss said I have to submit the report by Friday.