为什么这句话中有两个动词?1.He has written a letter.2.He had written a letter when I came.这里3.He will have written a letter before I come.4.He had been writing a letter for hours by the time I came.以上4句话中有HAVE的现在式

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为什么这句话中有两个动词?1.He has written a letter.2.He had written a letter when I came.这里3.He will have written a letter before I come.4.He had been writing a letter for hours by the time I came.以上4句话中有HAVE的现在式
为什么这句话中有两个动词?
1.He has written a letter.
2.He had written a letter when I came.这里
3.He will have written a letter before I come.
4.He had been writing a letter for hours by the time I came.
以上4句话中有HAVE的现在式过去式过去分词都由have变化而来
如果说第一句中的动词是has?那么第二\三\四句中不就有has和came两个动词了么?如果说has不是动词,那么第一句中的动词是什么?并且第四句中有been和came两个动词郁闷了!

为什么这句话中有两个动词?1.He has written a letter.2.He had written a letter when I came.这里3.He will have written a letter before I come.4.He had been writing a letter for hours by the time I came.以上4句话中有HAVE的现在式
has,had,will have & had been 都不要理解为动词,它们都只是用于表示事态.
1里,动词是write,has + 过去分词,现在完成时的用法
2里,动词是write,had + 过去分词,过去完成时的.
3里,主句里动词是write,从句（before I come）修饰时间,动词是come; will have + 过去分词,将来完成时的用法.
4里,主句动词是write,从句也是修饰时间,动词是come,had been doing sth,是过去完成进行时.
希望没解释错,N年前学的了.记住几个事态的用法,造句时套上不同的动词就可以了.

出于主句和从句的关系
主句有自己的谓语，从句也有自己的谓语
2 主句谓语 had 从句谓语 came
34也是一样

为什么这句话中有两个动词?
我不明白你郁闷甚麽
一个句子里，要有几个动词都可以的
就看你句子怎样造啊
不是甚麽主句，从句的问题
一个主句或从句，都可以有好几个动词的

很基础的东西，从句啦，其实是两个句子用连词连接起来，既然是两个句子当然可以用两个动词啦，看看语法书，多做阅读吧~

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