اللغة الإنجليزية فصل أول

Unit 2

Lesson 2

Student’s Book page 21

 

GRAMMAR

Modal verbs of obligation and prohibition

● English has several different ways of talking about obligation (something that is necessary), prohibition (something that we are obliged not to do), permission (something that we are permitted to do) and giving advice. Some of these use modal verbs such as must, should and can. Modal verbs do not change form in the present tense.

 

must/mustn’t

-I must do my homework. (The obligation comes from the speaker.)

-You mustn’t talk in the library. (You are obliged not to talk in the library.)

 

have to/don’t have to

-You have to take off your shoes before entering someone’s home. (The obligation comes from somebody else.)

-We don’t have to go to school on Fridays. (There is no obligation.)

 

can/can’t

-You can have another slice of pizza if you want to.

-You can’t come in yet – the floor is wet!

 

should/shouldn’t

-You should go up the Eiffel Tower if you visit Paris on holiday.

-You should drive carefully all the time.

-You shouldn’t point at people. It’s rude.

-Students shouldn’t leave their homework until late in the evening.