has been doing是什么时态 since

而今你们对于has been doing是什么时态令人难以置信，你们都需要剖析一下has been doing是什么时态，那么夕夕也在网络上收集了一些对于since的一些信息来分享给你们，真相曝光让人不可思议，你们一起来简单了解下吧。

had been doing是过去完成进行时态:过去完成进行时:就是相对过去的某个时刻来说已经对现在有直接影响并且还在进行的动作.而楼上回答的不对;现在完成进行时应该是:have been doing.

完成进行时

构成:have/has been doing sth. 或 have/has been + v.-ing 例句:I have been working for 12 hours. 我已经工作了12小时.

现在完成进行时(1.表示从过去某时开始一直持续到现在的动作,并且还将持续下去.2.表示在说话时刻之前到现在正在进行的动作.)

has been doing表示动作到现在为止一直在做 i have been waiting for you for an hour. had been doing表示动作到过去某一时刻为止一直在做.

一般现在时就是现在的一般状态,不强调正在发生,而是事实如此,还有用一般现在时表将来时,用在if条件句.have been doing现在完成进行时,用作时间,原因,状语从句中为非谓语

have been doing sth是现在完成进行时,指从现在看来已经完成并继续进行的动作,had加过去分词,是过去完成时,指在过去看来已经完成的动作,have、has加过去分词是现在完成时,指从现在看来已经完成的动作…

He has been studying this book for more than two years. This book has been being studied for more than two years have/has been being + done

绝对有 例 i have been doing homework all night. you must have been doing some stressing work, go get some sleep

present perfect tense

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