when的时态用法When的从句的时态可以有哪些?还有主句的时态可以任意吗?.比如刚做到这一题They had just reached the middle when there came a great shout behind them.这一句应该用when 可是从句是过去时 主句可以是过去完成时吗?
问题描述：
when的时态用法
When的从句的时态可以有哪些?
还有主句的时态可以任意吗?.
比如刚做到这一题
They had just reached the middle when there came a great shout behind them.
这一句应该用when 可是从句是过去时 主句可以是过去完成时吗?
答
一、when可以和延续性动词连用,也可以和短暂性动词连用；而while和as只能和延续性动词连用.① Why do you want a new job when youve got such a good one already?（get为短暂性动词）你已经找到如此好的工作,为何...