2.John was_studying in his room when he heard screaming.
约翰正在房间学习,这时他听到了一声尖叫。
【句型透视】(1)be doing ... when ... 表示“正在做……这时突然……”,其中when 为并列连词,表示“这时;突然”,相当于and at this/that time。
We were discussing the problem when there was a power failure.
我们正在讨论那个问题,这时停电了。
(2)具有相同含义的句型还有:
be about to do ... when ... 正要做……这时(突然)……
be (just) going to do ... when ...
正要做……这时(突然)……
be on the point of doing ... when ...
正要做……这时(突然)……
had just done ... when ...
刚做了……这时(突然)……
The thief was on the point of putting his hand into the lady's handbag when the bus suddenly stopped.
小偷正要把手伸进那位女士的手提包中,这时公共汽车突然停了。
They had just finished the work when it rained.
他们刚完成工作,就在这时下雨了。
【关键一点】 when除了用作并列连词外,还可以作为从属连词,引导状语从句,意为“当……时候;如果;然后;既然;却;可是”等。
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