Unit 4 Inventions and Inventors

一、本周教学重点： 1. 复习被动语态 2. 情态动词表达怀疑、确定和可能。 3. 重点词汇

二、具体内容： （一）被动语态： 1. 一般现在时被动语态基本结构： 主语＋ am/is/are＋过去分词 The food is placed in the oven. They are turned into heat.

2. 一般过去时被动语态基本结构： 主语＋was/were＋过去分词 Magic Squares were invented in China. Papermaking was introduced into Japan

in 610. 3. 情态动词被动语态基本结构： 主语＋ can/should/must ＋ be＋过去分词 School uniform must be worn at all

times.

4. 一般将来时被动语态基本结构： 主语＋will ＋ be＋过去分词 It can’t be a radio because it’s too big to

be a radio. The report will ______ （ finish ） in two

days’ time. Milk should _______ （ keep ） in the fridge. White clothes and colored clothes should

not _______ （ wash ） together. School uniforms needn’t

______ （ wear ） at all times.

（二）情态动词： 当不是很确定时，用might 或 may. （ might

比 may更不确定） Who knows what will happen. You may

even have married by then. It might be a tool for cutting things. I

don’t know. 当确定某件事是唯一的可能时，用must. It must be some sort of toy. 当确信不可能发生时，用 cannot. It cannot be a radio because it’s too big to

be a radio.

Ex. Complete the sentences with might be / may be, cannot be, or must be.

1. This exam _________ too difficult for the students. I don’t think they can finish it.

2. It _________ a book for children. There are many cartoons in it.

3. It _________ true. I think you made a mistake. 4. Mr. Smith ________________ in London, Paris, or

Tokyo. No one knows for sure. 5. That _________ John. He is in New York now. 6. Did you hear the doorbell? It _______ Nicholas. I

am expecting him.

（三）重点词汇： 1. In many big cities in the world, the overuse of

cars is thought to be one of the major causes of air pollution.

over＋名词 /形容词，表示“过多，过于” The over-load truck caused a serious road accident. She always works overtime, so she has to leave her

baby cared for by her mother. be thought to be 被认为，被看作 She is thought to be the top student in our class. Jane is thought to be busy preparing for the exam.

2. However we are also warned not to ask for pretty colors, because the car will come in gray only.

warn No one warned him of the danger. I warned her not to get close to the

dog but she wouldn’t hear of it.

3. Other experts are sure that the future will be happy.

be sure that… I am sure that smoking will hurt you. Are you sure that John will come this afternoon? 4. If gas is in short supply, the super car will run

on water. be in short … The cheaper it is, the better. I’m short of money. on 靠 He finds it difficult to live on his salary. They live mostly on vegetables from their garden.

5. As a rule, soft fruits like strawberries, etc, are difficult to freeze.

as a rule 一般来说，通常是 As a rule, she goes out early every

evening looking for work. As a rule, we get home at 6.

6. You should be careful the first time you wash your shirt because the blue color might come out and mark the white part.

come out 开花，出版，退色，计算出来 This magazine comes out monthly. Some flowers have begun to come out. I washed the shirt twice but the ink still hasn’t

come out. 7. observe 观察 I observed a letter on the table. Did you observe anything strange in that boy’s

behavior?

［课堂练习］ I. 单选。 1. Have you ever       this kind of moon cakes?   A. eat                 B. eats               C. eating                D. eaten 2. The knives are used       cutting things.   A. in                   B. to                 C. for  

                 D. of 3. They are used for      the style of a shoe.   A. change           B. changes         C. changing  

         D. changed

4. –Must I stay at home, Mum?   - No, you      .   A. needn’t           B. mustn’t         C.

don’t                 D. may not 5. She asked them       things about.   A. not to litter      B. don’t litter      C. not

litter             D. no litter 6. I’m not sure      he will come back home

tomorrow or not.   A. when              B. what             C.

whether             D. where

7. Look. These       be dinosaur eggs because they are the biggest of all.

  A. must              B. can                C. should               D. may

8. –I was told to take umbrella with me.   --Oh, no. look at the sky. It’s sunny and       rain.   A. must              B. can’t             C. may 

                 D. needn’t 9. The light in the office is off. The teacher      be

there now.   A. may               B. can’t             C. mustn’t 

            D. must

II. 完成句子： 1. 警察阻止孩子们在街上玩耍。 The policeman stopped the children

              in the street. 2. 去年他去日本学医。 Last year, he went to Japan                     . 3. 她每天早起以便能读英语。 She gets up early every day            she

can read English.

III. 连词成句 1. The money/ count/ every evening ___________________________________________

__________ 2. The children/ take care of /in the

kindergarten _________________________________________ 3. English/ speak/ everywhere ___________________________________________

______________