短语动词变被动：后面介词不可省略，如 look after、hand in、take care of；
现在完成时被动：常搭配 already、yet、so far、over the past few years 等时间标志词。
二、被动语态易混辨析短句（背诵提分）
The shop opens at 8 every day.（主动表被动，描述事物固有属性）
The door is opened by the guard.（纯被动，强调具体动作）
The book sells well.（畅销类，主动表被动）
The book is sold in this shop.（客观售卖，标准被动）
Great changes have taken place here.（无被动，杜绝错误表达）
The accident happened yesterday.（happen 无被动）
He is made to study hard.（被动还原to）
The baby is looked after well.（固定短语被动，介词不丢）
Many trees have been planted these years.（现在完成时被动）
The work has been finished already.（完成时被动经典句型）
Keys are used for opening doors.（物品用途高频被动）
Homework must be finished on time.（情态动词被动必考）
三、中考被动语态15道真题精选
（精选各地中考真题，含现在完成时，考点全面）1. Many new houses ______ in this town last year.A. build B. built C. are built D. were built2. —Can teenagers use mobile phones at school?—No. They ______ not to use them in class.A. ask B. are asked C. were asked D. will ask3. A new sports center ______ in our city next month.A. will build B. will be built C. is built D. was built4. Tea ______ by farmers in many places of China.A. grows B. is grown C. grew D. was grown5. The little boy ______ to return the book on time yesterday.A. told B. is told C. was told D. will be told6. Lots of new schools ______ in our city over the past few years.A. have built B. have been built C. were built D. will be built7. These storybooks ______ to the children last week.A. give B. are given C. gave D. were given8. The work ______ in two hours. Let's hurry!A. will finish B. is finished C. will be finished D. was finished9. Teenagers ______ to follow the traffic rules.A. should ask B. should be asked C. ask D. are ask10. This kind of computer ______ in Shanghai.A. is made B. makes C. made D. are made11. The letter ______ by my sister yesterday evening.A. writes B. wrote C. is written D. was written12. These flowers ______ every day.A. water B. are watered C. watered D. were watered13. A football match ______ in our school next Friday.A. will hold B. is held C. will be held D. holds14. Many old streets ______ already ______ in my hometown.A. have; repaired B. have; been repaired C. are; repaired D. were; repaired15. Your homework must ______ before class.A. hand in B. be handed in C. handed in D. are handed in
