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1、when 表示“正在那时/这时 （突然）”=at that/this time 的用法小结,A. when 前面的分句使用过去进行时。,如: ( 1 ) He was still smiling when the door opened and his wife came in. 他正笑着，正在这时,门突然开了,他妻子走了进来。,( 2 ) I was thinking of this when I heard my name called. 我正想着这件事，正在这时,突然听到有人叫我的名字。,B. when 前面的分句使用 was (were) about to, was (were) on
2、 the point 等。表示：正要做.这时/那时.（另一个动作发生了）,如: ( 1 ) We were about to start when it began to rain. 我们正要出发，就在这时开始下雨了。 ( 2 ) He was on the point of leaving when someone knocked at the door. 他正要离开，就在这时有人敲门。,C. when 之前的分句使用过去完成时,其中 sb had hardly / scarcely /barely when 表示“刚刚完成 .（前一个动作），就在这时.（后一个动作发生了）” 如: ( 1
3、) We had hardly fallen asleep when the bell rang. 我们刚刚入睡,就在这时铃声响了起来。 ( 2 ) He had scarcely arrived when he had to leave again. 他刚刚到达，就在这时又要离开了。,即：when 用于以下结构中表示： “正在这时/那时”,1.be doing . when . 正在做.这时/那时.（另一个动作发生了）2.be about to do. when. 正要做.这时/那时.（另一个动作发生了）3.be on the point of doing .when. 正要做.这时/那时.
4、（另一个动作发生了）4.had just done .when . 刚做完某事，这时/那时.（另一个动作发生了）,1. I had finished my homework and _watch the olympics when the power was cut off.A. was going to B. was about to C. was to D. would,B,2.We were getting in the wheat_suddenly it poured with rain.A. While B.when C.as D.before,B,3. She had just f
5、inished her homework_ her mother asked her to practice playing the piano yesterday. A. when B. while C. after D. since,A,4.They were discussing the problem _ the teacher came in.A. when B. while C. after D. since5.Jenny was holidaying with her family in a wildlife park _she was bitten on the leg by a lion.A. when B. while C. since D. once6.He was about to tell me the secret _ someone patted him on the shoulder.A. as B. until C. while D. when,A,A,D,7.She opened her eyes and was about to cry out_ she heard her father urgentlytelling her to keep quiet.A. while B. when C. before D. after,B,
