John said that he was leaving for london on wednesday.

问题描述:

John said that he was leaving for london on wednesday.
he后面为什么用过去式was
我看这句明明是将来式嘛

因为主句谓语是过去式 said,所以宾语从句的谓语也应该用相应的过去式.was leaving 叫做过去将来时