这个是在If引导的条件状语从句中,表示:"万一",即可表示不能实现的假设,又可表示可以实现的假设.
如:If he should fail to come ,ask Lee to work in his place .
万一他不来,就叫李代替他的工作.
你的这个句子中也是一样的.假如你看到James的话,请他打我电话.
If you__ see James,ask him to phone me ,为什么用should?
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