He has just arrive but he talks as if he knew all about it.为什么用knew?

来源:百度知道 编辑:UC知道 时间:2024/06/18 00:19:13
为什么不用know?
是不是只有在主句的谓语动词是实意动词才用虚拟语气?谢谢了两位老师!

as if虚拟语气

as if = as though = (好像) = 引导副词子句*** 表示 (强烈假定)
He speaks as if he were a teacher.
He behaved as though nothing had happened.

主要子句---现在式---副词子句---假设用过去式

出现了as if ,表虚拟,实际上他并不懂这个,而他假装懂得。
在英语语法里,用一般过去式表示虚拟。

因为。。has 吧