Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer?by next year he will have worked in New York for five years.Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer
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Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer?by next year he will have worked in New York for five years.Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer
Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer?
by next year he will have worked in New York for five years.
Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer
为什么一个是将来完成时,一个是将来完成进行时
两个都一样呀,都是BY加将来时间,还有一个FOR加时间段
Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer?by next year he will have worked in New York for five years.Mrs.White became a teacher in 1985.She will have been teaching for twenty years by next summer
两个句子都说的是未来,所以都用将来时,之所以用的完成时态不同,关键在于句子的两个动词.
一个是teach,“教书”,这是一个瞬间动词或非延续性动词,不能与表示一段时间的状语或疑问词连用,她教了20年书是一个延续过程,只能用完成进行时表过程状态;另一个是work,这是一个延续性动词,所以可以直接用完成时.