一句句子语法
问题描述：
一句句子语法
he (has not yet returned).he will (returned) in ten minutes.用短语动词be改写括号中的内容,isn't back yet.he will be back in ten minutes.我的问题是he isn't back yet是什么时态能改成he hasn't be back yet
答
能改成he hasn't be back yet
有了yet,这个句子就是现在完成时态