If he took Flight 307,he () on time.为什么填arrived ,而不是should+动词原形

问题描述:

If he took Flight 307,he () on time.为什么填arrived ,而不是should+动词原形
虚拟语气不是应该
if 过去时,should/would +动词原型吗?

此处是虚拟语态,表示与现在事实相反;
If sb.did...,sb did...
用过去式