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1、Unit 13 Were trying to save the earth单元语法小专题Grammar Focus动词的时态（一）1一、现在进行时现在进行时表示现在正在进行或发生的动作，由“be(am, is, are)+动词的现在分词”构成。常用的时间状语有now, at this moment, 或句首有提示词look, listen等。如：Im reading book now.我现在正在读一本书。二、现在完成时现在完成时表示过去发生的某个动作对现在造成的影响和结果,或表示过去已经开始，持续到现在的动作或状态。由“havehas+动词的过去分词”构成，常与already, never,
2、ever, just, yet等时间状语或these days, for two years, since 2000,since+过去时态等连用。如：I have already posted the photos. 我已经把这些照片寄出去了。动词的语态 一般现在时的被动语态由“am(is, are) +及物动词的过去分词”构成；一般过去时的被动语态由“was(were)+及物动词的过去分词”构成；一般将来时的被动语态由“will be +及物动词的过去分词”构成，现在进行时的被动语态由“am(is, are)+ being及物动词的过去分词”构成；在完成时的被动语态由“have(has)be
3、en+及物动词的过去分词”构成；情态动词的被动语态由“情态动词+及物动词的过去分词”构成。如：Computers are made in the USA.计算机是在美国被制造的。This park was built in 1999.这个公园建造于1999年。The young trees should be planted in spring.应该在春天植树。The child has been taken care of by her all these years.这些年来，这个孩子都由她照顾。These homework will be finished in ten minutes.
4、这些作业将在10分钟内完成。used to的用法 used to后面跟动词原形，表示“过去常常做某事” 表示“过去常常做某事”。其否定形式为didnt use to do sth.或usednt to do sth.；一般疑问形式为Used sb. to do sth.?或Did sb. use to do sth.?附加疑问句式为use(d)nt sb.或didnt sb.。如：Mr. Green used to relax himself by listening to music.格林先生过去经常通过听音乐来放松自己。同步语法强化训练.用括号内所给动词的适当形式填空。1. A talk
5、on science _ (give) in our school next Sunday.2. The letter_ (write) in Japanese. Can you read it for me?3. Chinese _ (speak) by more and more people in the world now.4.The magazines _ (must return) to the library in two weeks.5.I like to eat the rice that _ (grow) in the south of China.6.Something
6、must _ (do) to make our city a better place to live in.7.Three patients_ (operate) on by the famous doctor in the past 10 hours.8.We_ (tell) not to play soccer in the street.9.The boy was often seen to_ (read) books by the lake after school.10.The phone _ (invent) by Bell.句型转换，每空一词。11. I have just l
7、earned five hundred English words.(改为一般疑问句)_you just_ five hundred English words?12. They built a new park in our city last year.(改为被动语态)A new park_ _in our city last year.13.People used radios to learn English in the past.(改为被动语态)Radios_ _to learn English in the past.14.You can bring your friends t
8、o my birthday party tomorrow evening.(改为被动语态)Your friends_ _ _to my birthday party tomorrow evening.15. The students clean the classroom every day.（用now作时间状语改写句子）The students the classroom now.单元语法小专题Grammar Focus. 1. will be given 2. is written 3. is spoken 4. must be returned 5. is grown 6. be done 7. have been operated 8. are told 9. read 10.was invented. 11. Have; learned 12. was built 13. were used 14. can be brought 15. are cleaning