can(能,會), may(可以,可能,也許), must(必須,一定,應(yīng)該) have to(必須,不得不)
1. 肯定句結(jié)構(gòu):主語+can/may/must+動詞原形+其它,例如:
I must go now.
2. 否定句結(jié)構(gòu): 在can/may/must后加not,例如:
You mustn’t talk aloud in the library.
3. 一般疑問句結(jié)構(gòu): 把can/may/must提在主語前,例如:
Must you go now? (Yes, I must. No, I needn’t.)
May I open the window? (Yes, you may. No, you needn’t.)
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