1、was it in 1969( that )the American astronaut succeeded in

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1、was it in 1969( that )the American astronaut succeeded in landing on the moon?
为什么括号里用的是that而不是when
2/I'm wondering ( who )he expects will win the gold medal in Men's single
为什么只能用who不能用whom
3 when he came to himself,he found himself( tied )to a tree,with his mouth filled with a towel
关于found为什么用过去分词不用ing形式,什么时候用ing或过去分词形式
相同的例子还有：their had their house broken,but nothing was found (missing)
为什么此时括号里是ing形式
4He was born in the year(when)the war broke out
为什么括号里用when不能用which,二者分别在什么情况下用
5he said he would pay (a)second visit
为什么是a而不是the,什么时候用the?
6there was (none) left
为什么不能用nothing,二者区别是什么
7this is the garden( I once paid a visit to)
为什么括号里不能改用where I once paid a visit?

1.这是强调句的一般疑问句形式,was it .that.判断句子是否是强调句,可以将was it .that这三个词去掉,如果句子还是完整的,这句话就是强调句型.另外,如果句子是was it 1969( )the American astronaut succeeded in landing on the moon?这个时候填when,是定语从句.
2.因为要填的词在宾语从句中做从句的主语,只能用who.he expects（ who will win the gold medal in Men's single）
3.found不是过去分词,而是过去式,时间状语从句,主从句时态要一致.heir had their house broken,but nothing was found (missing) 这句话中found是过去分词,因为是被动语态“被发现”,而missing在这里看作是形容词“丢失的”.过去分词表示被动、完成、现在分词表示主动、进行.
4.这是定语从句问题,定语从句选关系代词还是关系副词要看从句语法上是否完整,( )the war broke out语法上是完整的,只能选关系副词when作状语.
5.the +序数词表示“第几次”,强调次序.a+序数词表示“再一、又一”
6.none = not any,not one 一点也没有；一个也没有,即数量概念.既可指人,也可指物,代指上文提到的事物,含特指概念.
nothing= not anything,意为"没有任何东西;什么也没有",强调内容,只能指物,泛指.
7.和第四题是相同的问题,看从句部分I once paid a visit to（?）从句部分是不完整的,to后面还应该有个宾语,所以只能填关系代词that或which,由于关系代词在从句中作宾语,可以省略.
再问：以第4和第7句为例，怎样判断句子缺不缺成分？
再答：从句中如果是及物动词，句子要有主谓宾才算完整；如果是不及物动词，有主谓语就是完整的。 the war （主语）broke out（谓语，不及物动词短语）完整 I （主语）once paid a visit to（谓语，及物动词短语）不完整

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