含情態(tài)動詞的被動語態(tài)講解及練習(xí)

1、第七單元語法知識含有情態(tài)動詞的被動語態(tài)，情態(tài)動詞有should, may, might, can, could, must,will,would 等。一、基本句型結(jié)構(gòu)：1肯定句：主語+情態(tài)動詞+be+過去分詞（+by.） eg: Teen agers should be allowed to go shopp ing.Tables can be made of ston es.The work must be fini shed today.The flowers may be pla nted in February.2、否定句：主語+情態(tài)動詞+not +be+ 過去分詞（+by.） eg:

2、 Teenagers shouldn t be allowed to go shopping.Tables cantbe made of ston es.The work mustn tbe finished today. （mustn t 加?mt】： 不能）The flowers mayn t me ?it be pla nted in February.3、一般疑問句：情態(tài)動詞 +主語+be+過去分詞（+by.）? eg: Should tee nagers be allowed to go shopp ing?Yes, they should. No, they should n t.

3、Can tables be made of stones? Yes, they can. No, they cant.Must the work be fini shed today?Yes, it must.No, it needn t./ No, it don thave to.May the flowers be pla nted in February? Y es, they may. No, they maynt.4、 特殊疑問句：特殊疑問詞 +情態(tài)動詞+主語+be+過去分詞（+by.） ? eg:What should tee nagers be allowed?What can

4、tables be made of?Whe n must be work be fini shed?Whe n may the flowers be pla nted?二、含有情態(tài)動詞的主動語態(tài)與被動語態(tài)的轉(zhuǎn)換：eg: 1）. We （主語）can （情態(tài)動詞）write （謂語）letters （賓語）in_English.（賓語補(bǔ)足語）Letters（主語）can（情態(tài)動詞）be_written_（謂語）in English（賓語）by us.（賓語補(bǔ)足語）2）. Parents （主語）should （情態(tài)動詞）allow_ （謂語）teenagers（賓語）to_choose_ the

5、ir own_ clothes.Teenagers （主語）should （情態(tài)動詞）be_allowed （謂語）to choose their own clothes （賓語）by their parents. _ （賓語補(bǔ)足語）3）. You （主語）must （情態(tài)動詞）clean （謂語）your bedroom （賓語）every. day.（時間狀語）Your bedroom （主語）must （情態(tài)動詞）be cleaned （謂語）every. day （時間狀語）by you.（賓語）例題：1. The old people should（speak） to politel

6、y.2. Anna（in vite） to my birthday party.3. Teen agers should（allow） to surf the In ternet.4. We should clean the classroom every day.（被動語態(tài)）The classroomevery day.5. Eightee n-year-olds should be allowed to drink.（否定句）Eightee n-year-oldsallowed to drink.6. The lights should be turned off whe n you leave he classroom.（主動語態(tài)）Y