"Has he woken up yet?""No, he's still asleep."

问题描述:

"Has he woken up yet?""No, he's still asleep."
“他醒了吗?”“没有,他还在睡.”
这里的yet是做什么的?

表时间状态,只能用于现在完成时态
和now,already...用法一样~!