语言学：英语知多少之英语时态（6）
将来完成时（shall）will+have+动词过去分词
before+将来时间或by+将来时间
before或by the time引导的现在时的从句
He will have worked for us.=He will work for us.
过去将来完成时
should / would have done sth.
He said that he would have worked for us.=He said that he would work for us.
现在完成进行时
基本与现在完成时相同，但是现在完成进行时只能表示仍然持续的概念
have/has been +-ing 分词
He has been working for us for ten years.=He has worked for us for ten years.
过去完成进行时
had been +-ing 分词
He said that he had been working for us for ten years.=He said that he had worked for us for ten years.
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