另外while还有别的用法，while引导状语从句,有以下两种含义： 1．表示某个动作正在进行的'同时,另一动作也在进行之中,这时主从句都用进行时态,有对同类的两个动作进行对比的意味.如： While I was playing the piano,she was dancing．我在弹钢琴,她在跳舞. While Jim is picking apples,Kate is carrying apples to the truck．吉姆正在摘苹果,凯特正在把苹果搬到卡车上去. 2．表示某个动作正在进行时,又发生了另一动作（该动作用一般过去时）.如： While I was reading,I fell asleep．我读着读着就睡着了. While we were swimming in the river,we saw a fish jump out of the water．我们正在河中游泳时,看见一条鱼跃出了水面. 上一篇：run的过去式和过去分词形式 下一篇：invent的用法和搭配 |