after he had corrected them

问题描述:

after he had corrected them
请问如果这句话没有had行吗?意思一样不?

意思是不一样的
因为“had corrected”是“不久之前”才纠正过来的意思
而“corrected”是纠正了很久的意思
e.g.Mary had died.(即是玛丽在不久之前去世了的意思)