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有关英语语法it,that,which的问题,

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有关英语语法it,that,which的问题,
Mister Armstrong also helped write a funny book about life as a full-time television watcher.It is called the "Official Couch Potato Handbook." 这句话中 的it 可以用that
Couch potatoes enjoy watching television just as mouse potatoes enjoy working on computers.A computer mouse is the device that moves the pointer,or cursor,on a computer screen.这句话中的that可以用which替代吗?
有关英语语法it,that,which的问题,
第一个 当然可以,都是代词哪有不能做主语的道理
第二个 可以
定语从句中只能使用关系词that不能使用which的情况主要有:
1.当先行词是不定代词时,如:all ,few,little,much,every,something,anything,everything等
2.当先行词被不定代词little,few,no,any等或被 the only,the very,the same等修饰时等
3.当先行词被序数词或形容词最高级修饰时
4.先行词既有人又有物时
5.在疑问词which开头的句子中