Soluzione del esercizio 2 di Performer B1 Phases, Vol. 1

MUSTN'T

To talk about a prohibition imposed by rules and laws.

Example:

• You mustn't take library books without permission.

To express a prohibition coming from the speaker.

Example:

• You mustn't touch the artwork; it's very delicate.

To express a personal prohibition or responsibility.

Example:

• I mustn't forget to bring my packed lunch to school.

DON'T / DOESN'T HAVE TO

To express the absence of obligation to do something or when something is not necessary.

Example:

• Susan doesn't have to hand in the project now, as the deadline is next week.
• You don't have to attend the meeting if you're not feeling well.

DON'T / DOESN'T NEED TO

To say that something is not necessary (there is no obligation, but you can if you want)

Example:

• You don't need to stay in the classroom during the break.
• She doesn't need to apologize; it wasn't her fault.
• You needn't worry about the details; I'll take care of everything.