一个英语的完成时问题
问题描述:
一个英语的完成时问题
there has a tree 和 there has been a tree 两者有什么区别?还有顺便跟我说说完成时什么时候要用has been done什么时候直接has done
答
there has a tree中,has作实意动词,这句话的意思为有一棵树
there has been a tree中,has作助动词,此句的结构为现在完成时,意思为这棵树一直都在
has been done是被动语态,而has done是主动语态