含情態(tài)動詞的被動語態(tài).ppt

1、語法學(xué)習(xí),含情態(tài)動詞的被動語態(tài),含情態(tài)動詞的被動語態(tài),常用的情態(tài)動詞有：,can, could (能；會), may; might (可以) must(必須), should(應(yīng)該), would(愿意) have to(必須；不得不), had better(最好做),主動句變被動句的步驟與其它情況相同。,1. We should allow teenagers to watch TV on Sunday.,Teenagers should be allowed to watch TV on Sunday( by us) .,2. My mother can cook delicious m

2、eals. Delicious meals can be cooked ( by my mother ).,3. People may catch fish in the river.,Fish may be caught in the river (by people).,4.we must keep teenagers away from the Internet? Teenagers must be kept away from the Internet.,can/could must should may/might had better have to,情態(tài)動詞+be +過去分詞,b

3、e done,結(jié)構(gòu),1.The flowers _often. A. must be water B. must be watered C. must watered D. must water 2. The books may_ for two weeks. A. be kept B. be borrowed C. keep D. borrow 3 The broken bike_ here by Mr Smith. A. can mend B. can mended C. can be mend D. can be mended 4.Young trees should _ every y

4、ear. A. be plantedB. planted C. plant D. are planted,1.Your homework should be finished first. Your homework shouldnt be finished first. Should your homework be finished first ? 2. This magazine can be taken home. This magazine cant be taken home. Can this magazine be taken home ?,3. Trees must be w

5、atered every day. Trees mustnt be watered every day. Must trees be watered every day?,情態(tài)動詞+not + be + 過去分詞,can/could must should may/might had better,not be done,否定式,情態(tài)動詞+ 主語+ be + 過去分詞,Can/Could Must Should May,+ 主語 be done ？,一般疑問式,疑問詞+情態(tài)動詞+ 主語+ be + 過去分詞,can/could must should may/might,+ 主語 be don

6、e ？,疑問詞,特殊疑問式,When must this task be finished? 這項(xiàng)任務(wù)必須在什么時(shí)候完成？,含情態(tài)動詞的被動語態(tài),肯定句: 主語+ 情態(tài)動詞+ be+ 動詞過去分詞. 否定句: 主語+ 情態(tài)動詞+ not+ be+動詞過去分詞. 一般疑問句: 情態(tài)動詞+ 主語+ be+ 動詞過去分詞?,特殊疑問句：特殊疑問詞+ 情態(tài)動詞+ 主語+ be + 過去分詞 ？,4a Rewrite the sentences according to the example. 1. You must clean your bedroom every day. Your bedroom

7、 must be cleaned every day. 2. Parents should encourage teenagers to do social work for their community. Teenagers _ _. 3. Can Lucy do her homework tomorrow instead? Can _ _?,should be encouraged (by their parents) to do social work for their community,the homework be done (by Lucy) tomorrow instead

8、,n. 社區(qū)，社團(tuán),4. Do you think we must keep teenagers away from the Internet? Do you think teenagers _? 5. Parents should give teenagers chances to make their own decisions. Teenagers _ _,must be kept away from the Internet,should be given chances to make their own decisions.,keepaway from 避免接近，遠(yuǎn)離,n. 機(jī)會，

9、可能性,自己做決定,Should teenagers _ (ask) to move out when they start working? In many Western countries, teenagers _ (allow) to move out at eighteen. Their parents believe that they should _ (educate) to take care of themselves from a young age. This way, when they _ (start) working they can manage their

10、own lives.,4b Fill in the blanks with the correct forms of the words in brackets.,be asked,are allowed,be educated,start,v. 教育；教導(dǎo),v. 完成；應(yīng)付,However, in most Asian societies, it is not common for teenagers to _ (move) out. Chinese parents believe that it is better for children to live with parents who can _ (take) care of them. But the young should then look after their parents as they