He has come into the classroom.改为同义句He--- ---the classroom.原句是否有误,如果原句没错，用了has,come没变成came,是何用法?可以写成 He has been the classroom.
问题描述：
He has come into the classroom.改为同义句He--- ---the classroom.
原句是否有误,
如果原句没错，用了has,come没变成came,是何用法?
可以写成 He has been the classroom.
答
he has already come into the classroom
你那句话不对，少介词也。
COME再次不需要变成CAME，CAME是过去式，而这里的COME不是原形，是PP形式（过去分词）。也就是说这里的时态是完成时态，而现在完成时的形式是：HAVE/HAS+PP（过去分词），come,came,come分别为原形，过去式，过去分词（这个是最基本要背出来的,属于初中的）。
希望对你有帮助！
答
He was in the classroom
答
he has entered the classroom.
原句没有错.
答
He entered the classroom