1.从句为陈述句,常选择引导词that,that引导宾语从句无意义,不充当句子成分常省略。例句:He told us (that they would help us through the whole work.
2.从句为一般疑问句,常选择引导词if或whether,表示“是否”。在whether … or not结构中不能用if替换。例句:I don’t know if there will be a bus any more.
3.从句为特殊疑问句,常选择what,when,where,which,who,how等的疑问代词、副词作引导词。例句:He didn’t tell me when we should meet again.
当which引导的定语从句指代主句全部内容时,可以把which改为it,作形式主语,把原来的主句改成正在主语。或者把定语从句的整个信息改换为名词短语作主语,使原来的定语从句变成简单句。
例4: He indulges himself all day in computer games, which makes his parents extremely sad.
改为:It makes his parents extremely sad that he indulges himself all day in computer games.
他整天沉湎于电脑游戏,这使他父母伤心至极。(主语从句
或者:His indulgence in computer games all day makes his parents extremely sad. (名词短语
一般说来,用on和at表示“as soon as, once”。on后面常接“来、去”之类的词,at后面常接“听到、看到”之类的词。in后面接其他带动作的词,相对于从属连词“while”。
例1:On removing them he was stunned to see that the plates were fogged where the crystals had covered them.当他把晶体揭开时,发现盘子上方雾蒙蒙,他吃了一惊。
例2:In running down the stairs, I heard the clock struck twelve.
我在跑下楼的时候,听见钟敲了十二下。
例3:He jumped with joy at hearing the news.他一听到这个消息就高兴得跳了起来。
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