其基本构成是:have/has+done;过去完成时是指:在过去某个特定时间点或动作之前就发生的行为,即过去的过去。其基本构成是:had+done。 那为什么我们要在写作中适当加入完成时呢?因为多种时...
been是be的过去分词;done是do的过去分词。常见的用法是have done和have been done,have done是主动形式的现在完成式,have been done是被动式的现在完成式。 1、done的含义及相关短语用法 形容词adj.已完成的;煮熟的;合乎礼仪的;合乎规矩的感叹词表示接受建议)动词·做...
A. have you been doing B. have you done C. were you doing D. did you do 2) ––– Hi, Tracy, you look tired. ––– I am tired. I ___ the living room all day. A. painted B. had painted C. have been painting D. have painted 3) I won’t tell the stud...
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