Question

三题高一英语改错题，告诉我为什么这样改

1.the president wants to say something to the public which has not been said before.
which-that
2.playing computer games cost the boy plenty of time he should have spent the time doing his lessons
the time删去
3.children can see much which is wrong in the lives of their parents,so parents have to always behave themselves
which-that
为什么?
可以再帮我看一题么?
The girl, her fastest 400 metres was 4minutes 21.2 seconds, was an Olymipic swimmer
her-whose

Answer 1

1.不定代词做中心词，引导词必须用that. 比如something, somebody, someone, many, much, a lot etc.所以第三题和这个题其实是一种情况。这个是规定好的，所以你记住就好了，固定语法。
2.定语从句的修饰对象是time, 在原句中的成分是宾语。如果不省略引导词的话，应该是…plenty of time that he should have spent doing his lessons. 就是说，可以理解成that的作用已经是在重现了time,所以后面再加个time，就是错误的。而原句中time又是作宾语，语法规定先行词作宾语，引导词可省略，所以that又被省略了。
4.一个句子里面，只能有一个动词做谓语，如果出现了第二个动词，那就要将其变成从句或者非谓语化。你看这个句子里面，真正的谓语是后半句的was，所以中间插入的只能是个从句。her换成了whose，那就变成了定语从句，就没问题了。

Answer 2

1. 不定代词做先行词，关系代词用that。（这里先行词是something)

2. （that) he should have spent是定语从句，修饰time，因为that在从句中作宾语，所以被省略掉了，相当于he should have spent the time，所以再加上the time就重复了。

3. much 代词，理由参考1.

4. whose引导非限制性定语从句。因为这句话主要结构是：The girl....was an Olymipic swimmer。英语中逗号不能连接两个意义及结构都完整独立的句子，而her fastest 400 metres was 4minutes 21.2 seconds恰恰构成了独立的句子，所以只有把her改成whose，也就是改成非限制性定语从句，才能避免这个问题。

Answer 3

1，something的定语从句只能用that作为关系代词
2.因为he should have spent doing his lessons是用来修饰前面time的定语从句，也就是前面的time本身就是后面定语从句的宾语了
3. 和1一样，much后面定语从句的关系代词要用that

Answer 4

1.has not been said before做something的宾补
是宾语从句 用THAT引导
2.前文提到PLAY COMPUTER的time 与the time重复 后文的the time可省