This is a old computer .It works much slower.其中 It作什么语了 .

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句子里It 作主语
也是代词, 指代 old computer
再问：怎么说It 是主语呢？解释一下子？
再问： This is 做什么
再答： This 是主语 is 作谓语一般一个完整英语的句子, 都有主谓宾的结构, 有时可以没有宾语这跟汉语一样的, 这是一台旧电脑, "这"主语, "是"谓语, "旧电脑"宾语它工作得很慢. 它是主语, 工作是谓语
再问：是不是It在It works much slower句中作主语。
再答：是的因为这里是两个句子. It在第二个句子里做主语
再问：就是怎么判断一个定语从句？
再答：这里是两个句子, 没有定语从句如果改成 This is an old computer that works much slower. 那么that引导的后面的部分就是定语从句
再问：怎么判断的，给说说方法？
再答：一般定语从句有先行词, 如that, when, which, where 这样的词来引导然后, 前面一般是个名词另外, 你会发现定语从句会缺成分比如这里 that works much slower 缺主语, 而修饰的那个词 old computer 如果补上, 句子就刚好完整了一般就是从上面三点识别
再问： that when等词是关系词不是先行词
再问： that when等词是关系词不是先行词
再答：对,术语叫关系词
再问：什么是术语
再答：术语就是专业名词你要是满意的话,就请采纳吧, 能回收提问的知道财富.
再问：术语叫先行词吧？
再问：术语就是先行词吧？
再答：是的

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