(1)
Have you been here while I was out.
"while I was out"是过去时间状语,为何可以和完成时连用呢?
这里的"while I was out"难道是指从过去外出一直持续到我现在回来的讲话时刻吗?
(2)
I haven't studied English when I was at school.
"when I was at school"是过去时间状语,为何可以和完成时连用呢?
这里的"when I was at school"难道是指从过去我在学校一直持续到现在(讲话时刻)吗?