Page 26 - CBTis 69

INGLÉS

Read the sentences and write O (Obligation), U (Unnecessary), or P (Prohibition).

1 You mustn´t use your cell phone at your desk.

2 He has to wear a white coat.

3 She doesn´t have to work tomorrow.

4 you must answer your emails.

5 I don´t have to wear a uniform on Fridays.

GRAMMAR Must / have to

Modal Function Example

Must Obligation or You must be hard-working.
Have to necessity We have to be responsible and organized.
He has to keep calm.

Don´t have to Not necessary We don´t have to work on weekends.
He doesn´t have to wear a tie.

Mustn´t Prohibition You mustn´t wear jewelry in the kitchen.

We use mustand have
toto talk about
obligation and

prohibition. Note: We can also use can´t to

talk about prohibition.
We use the base form
of the verb after must You can´t eat in the office.
and have to.