hAs BEEn DonE是什么时态

12.过去将来完成时(would/should have done)13.现在完成进行时(have/has been doing)14.过去完成进行时(had been doing)15.将来完成进行时(will/shall have been doing)16.过去将来完成进行时(would/should have been doing)其实是

It has been raining for three hours.雨已经下了三个小时了 定义 将来完成时用来表示在将来某一时间以前已经完成或一直持续的动作。经常与before+将来时间或by+将来时间连用,也可与before或by the time短语引导的现在时的从句连用。将

3.基本结构:have/has + done 4.否定形式:have/has + not + done.5.一般疑问句:have或has提前。6.例句:I've written an article.It has been raining these days.过去完成时 1.概念:以过去某个时间为标准,在此以前发生

(过去完成时had done也包括在内)。例:主动:We have studied English for 3 years off and on at the spare-time school.被动:English has been studied for 3 years off and on at the spare-time school. (have随新主语变

(过去完成时“had done”也包括在内)。例:1、主动:We have studied English for 3 years at the spare-time school.被动:English has been studied by us for 3 years at the spare-time school.(“have”随新主语变为“

现在完成时的被动语态的特殊疑问句为:疑问词+have /has +been +done? 如:Who has been invited? 谁受到了邀请?用法要点 1.现在完成时不能单独与准确时间状语连用,(如表示过去的时间状语)如yesterday(morning、afternoon),last(

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