虚拟语气中与将来事实相反的从句中用did和should do怎么区分

关于虚拟语气的
虚拟语气中关于跟将来事实相反的,从句用should do或were to do,怎么区分用这两种形式呢?比如:
If they were to arrive before we leave,we should have a wonderful dinner.
If they should arrive before we leave,we should have a wonderful dinner.
这两种说法好像都说的通啊,那种不对呢?

第1个回答  2019-02-26
were to do 更着重于计划安排
should 则无此意
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