2be about to do...when...正要做……此时……

　　3had just done...when...刚做了……这时……

　　4be on the point of doing...when...正要做……这时……

　　(1)I was taking a bath when someone knocked at the door.

　　我正在洗澡，这时有人敲门。

　　(2)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袋中，这时公共汽车突然停了。

　　多维训练

　　(1)完成句子

　　①We were swimming in the lake when suddenly the storm started.

　　我们正在湖里游泳这时突然暴风雨来了。

　　②She had just finished her homework when her mother asked her to practise playing the piano yesterday.

　　昨天她刚刚完成作业这时母亲叫她练习弹钢琴。

　　(2)单句改错

　　①We had just begun to work while the machine broke down.while→when

　　②I was about to informing you of the sudden change when an unexpected visitor came.informing→inform

　　22

　　Jennifer was in the kitchen，with her hands in a bowl of flour，when she saw a small boy climb into a truck.詹妮弗在厨房里，双手在面粉碗里，这时她看到一个小男孩爬进了一辆卡车。

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