定语从句that的用法是怎样的

　　当that引导的主语从句或宾语从句太长时,常用it作形式主语或宾语而把that从句放在后面.下面是小编整理的相关内容，欢迎大家阅读参考！

　　从句中that的用法

　　一、that引导名词性从句时(即主语从句、宾语从句、表语从句、同位语从句),在从句中无具体含义,只起连接作用,而且在从句中也不作任何句子成分.它所引导的从句的句子结构和意义是完整的,而且从句一般是陈述一个事实.

　　例如:

　　①Thatshe was able to come made us very happy.

　　她能来使我们很高兴.

　　②The newsthatour team has won the match is true.

　　我们队赢了这场比赛的`消息是真的.

　　③The reason he didn't come wasthathe was ill.

　　他没来的原因是他病了.

　　当that引导的主语从句或宾语从句太长时,常用it作形式主语或宾语而把that从句放在后面.如:

　　①It is well—knownthatthe earth is round.

　　众所周知,地球是圆的.

　　②We find it necessarythatwe practise spoken English every day.

　　我们发现每天练习英语口语很有必要.

　　注意：

　　that引导的主语从句,表语从句以及同位语中,that不能省略.that引导的宾语从句,一般可以省去that,但在下面情况中不能省略——

　　1.在suggest,order等表示命令、请求、建议等动词后的宾语从句中,不能省;

　　2.由and或but所连接的两个引导的宾语从句时,第一个从句中的that可以省,第二个从句中的that不能省;

　　3.that引导的宾语从句,如果从句中还有其他状语从句,引导宾语从句的that不能省略.

　　Tell himthatif he is at home,I'll call to see him.

　　二,that引导定语从句要注意以下几点:

　　1.定语从句中缺主语,修饰人时用who /that,修饰物时用which /that引导.如:

　　Is this the factory which /thatmakes TV sets

　　The man who /thatvisited our school is from Australia.

　　2.从句中缺宾语,修饰人时用 who /whom /that或省略引导词;修饰物时用which /that或省略引导词.如:

　　Gone are the days which /thatwe spent together in the village.

　　He is the man who /whom /thatI think to be worthy of our praise.

　　3.用that不用which的七种情况:

　　①先行词前有形容词最高级或序数词修饰时,用that不用which引导.如:

　　This is the best placethatI have ever visited.

　　②先行词为little,much,all,none,few,(the)one,something,everything,nothing,anything等不定代词时,用that引导.如:

　　There is nothing in the worldthatcan frighten him.

　　③先行词既有指人的名词又有指物的名词时,用that引导.如:

　　He told us about the people and the citiesthathe had visited.

　　④先行词前有any,all,no,few,every,some,little,much,(the)very,(the)only,(the)last等词修饰时,用that引导.如:

　　This is the very coatthatI need.

　　⑤先行词为which时,为了避免重复,用that引导.如:

　　Which is the bookthatyou bought yesterday

　　⑥先行词在从句中作表语时,常用that引导.如:

　　Shanghai is no longer the citythatit used to be in the 1930's.

　　⑦当主句是There be...句型时,用that引导.

　　There are two tickets for the filmthatare for you two.

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