Unit 4 Inventions and Inventors

3. 情態動詞被動語態基本結構：
主語＋can/should/must＋be＋過去分詞
school uniform must be worn at all times.
4. 一般將來時被動語態基本結構：
主語＋will＋be＋過去分詞
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）情態動詞：
當不是很確定時，用might或may. （might比may更不確定）
who knows what will happen. you may even have married by then.
it might be a tool for cutting things. i don’t know.
當確定某件事是唯一的可能時，用must.
it must be some sort of toy.
當確信不可能發生時，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 a re 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）read the descriptions about some famous inventors, and guess who they are.
1. he lived in china in song dynasty. printing was invented by him. who was he?
2. he was british. he was born in edinburgh, scotland in 1847. he died in 1922. in 1876, he invented the first telephone. who was he?
3. he is chinese. he went to a university in southwest china to study farming technology. he was called “the father of hybrid rice”
4. these two brothers were americans. when they were young, they started to wonder why birds could fly in the sky. then they  started to make flying machines. they first tried to fly a plane in 1903.
5. he was an american inventor. he was born to a poor family in 1847. his mother taught him at home. he often observed things carefully and he liked to ask questions about them. he studied very hard and made over 1,300 inventions during his life time. one of his famous inventions was the light bulb.
 
（四）重點詞匯：
1. in many big cities in the world, the overuse of cars is thought to be one of th e major causes of air pollution.
over＋名詞/形容詞，表示“過多，過于”
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 被認為，被看作