举报
13xk要胜q
before I i shouted at the top of my voice, he had turned his head. 在我用我最大的声音喊出来之前,他已经回过头来。 这样动作就在我之前,就可以用过去完成时 举2个例子, 到现在为止,我已经完成作业了 I have finished my homework【 till now 】 有till now时间限定,说明是过去到现在一直在做。 他昨天下午5点前就把车修好了。 He had fixed his bike before 5 o'clock yesterday afternoon。 他是 在昨天5点这个过去的时间之前 就修好了,所以用过去完成时。