was doing是什么句式或什么时态.

was doing是什么句式或什么时态. he said what he was doing his homework是什么句式 was/were going to do sth.这是什么时态?那和 was.were doing sth.有什么区别 有by the time,用什么时态或什么句式? will be doing 是什么句式, Will be doing是什么时态 had been doing 是什么时态? had been doing是什么时态 had been doing是什么时态 he said what he was doing his homework是什么句式啊 was或were后动词用什么时态? was held 是什么时态 sb was doing sth when sth +动词过去式是什么时态急啊 拜托了啊 Since then he was been doing the work.怎么译?用的是什么时态? was/were doing/ to do 分别是什么时态?怎么有的用过去式表示将来? She was very worried.为什么是worried而不是worring或worry?这是个什么时态?在这里worry是什么词? was和were是什么人称,什么时态,还要英文例句 相当于英语中I was doing的时态是什么?有j'etais en train de 这样的说法吗?我想表达当时（过去的一个时间）【正在】做什么,就是相当于英语中I was doing这个时态,我可以表达成j'etais en train de 是不