情态动词主要用法情态动词主要用法: 一. can 的用法： 1.表能力 2.表示可能性 3.表示同意做某事,意为 “允许”, “可以” 4.表推测(主要用于否定句,疑问句) He cant speak Chinese. (表示能力) Can I smoke here? （表示许可） Anybody can make mistakes.（表示可能）二. must 的用法 1.表示按命令、规定、责任等必须要做的事。 在回答由 must 引导的一般疑问句时,如果表示肯定，用 must;如果表示否定,必须 用 neednt。 -Must I copy it now? -Yes, you must. (No, you neednt.) 2. 表示肯定的推测，意为”一定会”， “一定是”，多用于肯定句。三. need 的用法 need 作为情态动词使用时，多用于疑问句和否定句，后跟动词原形；作为行为 动词时，后跟带 to 的动词不定式。neednt 意思是“不必”。 他需要去看医生。He _ see a doctor. 四 may 的用法 1.表示“可以” ，用以询问或说明可否做某事。 2.用于表推测某事可能发生或某情况可能存在，意为 “可能”。情态动词练习：情态动词练习： ( )1-Susans parents have bought a large house with a swimming pool. -It _ be very expensive. Amust Bcan Cmustnt D、cant ( )2The notebook_ belong to SarahHer name is on the coverAmight Bcant Cmust Dmustnt ( )3.- May I put my bike here?- No，you_You should put it over thereAcouldnt Bneednt Cmustnt Dwont ( )4Boys，you_ be sitting in this roomIt is for your teachers onlyAshouldnt Bdont have to Cwont Dneednt ( )5-Whose pizza is this?-I think it_ be mineIm the only one who ordered a pizzaAmust Bcould Cmight Dcant ( ) 6. My brother cant sing but he _ play the piano.A. cant B. doesnt C. can D. dont ( )7. You look tired. You _ to have a good rest.A. must B. may C. should D. need ( ) 8.- Why do you think the man is running ? -He _ be _ for exercise because he is wearing a suit . A. must , running B. cant ; run C. cant ; running D. could ; running ( )9. -Mum , Ive been studying English since 8 oclock. _ I go out and play with Tom for a while?-No, Im afraid not. Besides, its raining outside now. A. Cant B. Wouldnt C. May not D. Wont