这里干吗不用so that?

问题描述:

这里干吗不用so that?
He was so foolish (that leave)his car unlocked.
A that leave B as to leave
为什么只能用as to leave 不能用that leave?它们的意思都是引导结果状语从句,意思都一样,但有什么区别?

他如此的傻以至于离开他的车没锁.
so.that 和 so.as to 都是如此.以至于的意思,但 so that 后跟从句,so as to 后跟动词.
在此leave是动词,所以为 as to leave.