However, as his career was beginning, Cai's parents sent him to the United States to study music.
I saw him as he was getting off the bus.
begin和set off是短暂性动词吧,为什么不是一般过去时?两句都用了be doing,句子该怎么理解呢?as后面接短暂性动词和延续性动词都可以吗?两句话中的as可以换成when或while吗?谢谢!
However, as his career was beginning, Cai's parents sent him to the United States to study music.
I saw him as he was getting off the bus.
一、延续性动词的进行体,表示动作正在发生的过程中,而终止性动词的进行体,从严格意义来讲,表示动作尚未发生,意味着“即将发生;就要发生;刚要发生”。我们在理解时,务必注意这个问题。划线部分,只要句意允许可以使用一般体(一般过去时),表明动作已发生。
作一对比:
I saw him as he was getting off the bus.(还没下车)
本句意味着:在他就要下车/刚要下车之时,我看见了他。
I saw him as he got off the bus.(已下车)
本句意味着:他刚刚下了车,我就看见了他。
以上两句,可以用 when 代替 as。
至此,已经回答了网友的第一个问题:为什么不是一般过去时?
二、关于第二个问题:两句话中的 as 可以换成 when 或 while 吗?
在这两句中,可以用 when 替换 as ,但 while 不可以。因为 while 引导的时间从句,谓语动词必须是延续的。而 as 和 when 可以延续,可以不延续。当主、从句都用了不延续的动作动作时,as 和 when 都表示两个动作几乎是同时发生。但是,相对而言,as 表示的主从句的两个动作更加紧凑!when 略有逊色。
正误判断如下:
However, as/when his career was beginning, Cai's parents sent him to the United States to study music. (正)
I saw him as/when he was getting off the bus.(正)
However, while his career was beginning, Cai's parents sent him to the United States to study music.(误)
I saw him while he was getting off the bus.(误)
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