Question

Had he lived longer是“如果他活得更久”吗?

Answer 1

had he lived longer是if he had lived longer的省略形式.

语法：虚拟语气

规则：从句中用过去完成时表示过去,主句中用would have done表示结论.如

If you had come here last night, you would have had a good time too.

这句话也可以将if省略,说成

Had you come here last night, you would have had a good time.