theboybasketballyesterday内容摘要：
tching TV from six to nine last night. What was he researching all day last Sunday? 3. 过去进行时还可以和 when, while, as引导的过去时间状语从句连用，形成复合句。 . While the lights were changing to red, a car suddenly appeared round the corner. 正当交通信号灯要变成红灯的时候，一辆小轿车突然从拐角处驶出来。 One day, when Henry was working in a restaurant, a snake suddenly appeared. 一天，当亨利正在餐馆里工作时，一条蛇突然钻了出来。 I was trying to pick it up when it bit me again. 我正试图捡起（那条蛇），突然它又咬了我一口。 As the doctors were checking him, the pain got worse. 医生给他做检查时，疼痛加剧了。 when， while， as都可以引导时间状语从句，但用法区别非常大。 一、 when可以和延续性动词连用，也可以和短暂性动词连用；而 while和 as只能和延续性动词连用。 . They arrived while we were having dinner. = They arrived when we were having dinner. 我们吃饭的时候他们到了。 二、由 when引导的时间状语从句，如果主句是过去进行时，从句应该用一般过去时，表示一个动作正在进行的时候另一个动作突然发生了，强调后一动作发生的突然性。 . We were talking when the teacher came in. 我们正在讲话，老师（突然）进。阅读剩余 0%
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