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选修6 Unit4 Language points.ppt

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选修6 Unit4 Language points.ppt
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1. What do you think green house gases do? 本句中think后接了一个由what引导的宾语从句。但应注意的是: 特殊宾语从句即当一般疑问句主句的谓语动词是 think, believe, suppose, consider, imagine, guess 和 suggest 等时,表疑问的词要放在主句前即句首。 例如:,[正] Who do you think will win in the game? [误] Do you think who will win in the game? 当然一般情况下宾语从句的疑问词应放在主句之后,例如: [误] Why do you know we can't cut down the big tree? [正] Do you know why we can't cut down the big tree?,2 … it is a rapid increase compared to most natural changes.,1). vt. 比较;对照。 compare…with…表示“把……与……相比 (同类相比) ” 如: Compare your answers with those at the back of the book to see if they are right. 把你的答案同书后面的答案对照一下,看看是否正确。 My handwriting can not be compared with my father’s.,我的书法不能与我父亲的相比。,2).vt. 喻为;比拟。 compare…to… 表示“把……比做……(异类相比,比喻)” 如: Man’s life is often compared do a candle. 人生常被比为蜡烛。 Shakespeare compared the world to a stage.,知识拓展 compared to /with 与……相比, 只能作状语 Compared to /with many women, she was indeed very fortunate.,莎士比亚把人世比做舞台。,3.How has this come about and does it matter?,come about : 发生,造成 相当于happen When Mother woke up, she didn’t know what had come about. I’ll never understand how it came about that you were late three times a week. 你知道那次空难是怎么发生的吗?随着电的使用,种种大变化发生了。,With the use of electricity, great changes have come about.,Do you know how the air accident came about?,4. There is no doubt that….,一、作不可数名词,作“疑惑;怀疑” ①肯定句中doubt多接whether (一般不用if代替) 同位语从句。如: There's some doubt ________he'll keep his promise. 他会不会信守诺言还难说。 She had her doubts ________the new book would sell well. 她怀疑新书是否会畅销。,whether,whether,②否定句中doubt多接that同位语从句。 如: There is no doubt ____ they will ask you for help. 毫无疑问,他们会请你帮忙的。 I have no doubt ____ you will succeed. 我毫不怀疑你会成功的。,that,that,二、作及物动词常用于下列句型中, 作“怀疑; 不能肯定; 不大相信“解, 一般不用进行时态。 ①用于否定句或疑问句, 后接that引导的宾语从句。如: I don't doubt ____ he is telling the truth. 我毫不怀疑他在讲真话。 Do you doubt ____ he will win the match? 你怀疑他会赢这场比赛吗?,that,that,②用于肯定句,一般接whether 或if引导的宾语从句.如: I doubt __________we will make a profit out of it. 我认为我们不可能从此事中获利。 We do
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