2Must = Have to + inf Has to + inf It is necessary to + inf presentMust =Have to + infالإلزامHas to + infIt is necessary to + infbe +allowed to + inf
3past Must = Had to + inf It was+necessary+inf Was\were + allowed to + inf
4future Must = Will + have to +inf It will +Be + necessary to + inf Will be + allowed to + inf
5Examples: She must do her H.W. (has) She has to do her H.W. She must wash the dishes. (necessary)It is necessary for her to wash the dishes.
6be + not +allowed to + inf النفيMustn’t =Don’t +Have to + infDoesn’t+ have to +infIt isn’t+ necessary to + infbe + not +allowed to + inf
7Examples: She mustn’t do her H.W. (have) She doesn’t have to her H.W. She mustn’t wash the dishes. (necessary)It isn’t necessary for her to wash the dishes.
8Am-Is\Are +sub +allowed to + inf? السؤالMust? =Do + sub + Have to + inf?Does + sub + have to +inf?Is it +sub+ necessary to + inf?Am-Is\Are +sub +allowed to + inf?
9Examples: Must she do her H.W? (have) Does she have to do her H.W? Must she wash the dishes. (necessary)Is it necessary for her to wash the dishes?
10My advice to you is to +inf النصيحةShould=Ought to +infHad better + infIf I were you, I’d……I advise you to +infMy advice to you is to +inf
11Examples: You should work hard. (better) You had better work hard. You ought to drive carefully. (if)If I were you I’d drive carefully.
12Shouldn’t= Oughtn’t to +inf Had better not + inf If I were you, I wouldn’t……I advise you not to + infMy advice to you is not to +inf
13Examples: You shouldn’t work hard. (better) You had better not work hard.You oughtn’t to drive fast. (if)If I were you, I wouldn’t drive fast.
14Choose the correct answer: 1- You…….go and see your grandparents.a-should b-shouldn’t c-mustn’t d-can2-I ……..go home now. I have to get up early.a- should b-must c- mustn’t d- shouldn’t3-You…….smoke here. it's forbidden.a-must b-mustn’t c-should d-shouldn’t4-People…….cover meat to avoid infection.A-must b-should c-shouldn’t d-can
155-One ……..drive slowly to avoid accidents. a-must b-mustn’t c-should d- shouldn’t6-You………climb the trees or you will fall.a- would b-mustn’t c- should d- might7-people……..leave meat lying around.a-must b-should c-shouldn’t d- may8-little children…..ride abike in the park.it’s prohibited.a-must b-should c-shouldn’t d-mustn’t9-you…….eat breakfast before going to work.A-must b-should c-may d- can