when 表示表示“正在那时正在那时/这时这时 （突然）（突然）”=at that/this time 的用法小结的用法小结A. when 前面的分句使用前面的分句使用过去进行过去进行时。时。 如如: ( 1 ) He was still smiling when the door opened and his wife came in. 他正笑着他正笑着，正在这时正在这时,门门突然突然开了开了,他妻子走了进来。他妻子走了进来。( 2 ) I was thinking of this when I heard my name called. 我正想着这件事我正想着这件事，正在这时正在这时,突然突然听到有人叫我听到有人叫我的名字。的名字。2021/8/141 B. when 前面的分句使用前面的分句使用 was (were) about to, was (were) on the point 等。等。表示：表示：正要做正要做.这时这时/那时那时.（另一个动作（另一个动作发生了）发生了） 如如: ( 1 ) We were about to start when it began to rain. 我们我们正正要出发要出发，就在这时就在这时开始下雨了。开始下雨了。 ( 2 ) He was on the point of leaving when someone knocked at the door. 他他正要离开，正要离开，就就在这时在这时有人敲门。有人敲门。2021/8/142C. when 之前的分句之前的分句使使用用过去完成时过去完成时,其中其中 sb had hardly / scarcely /barely when 表示表示“刚刚完成刚刚完成 .（前一个动作）（前一个动作），就在这时就在这时.（后一个动作发生了后一个动作发生了）” 如如: ( 1 ) We had hardly fallen asleep when the bell rang. 我们刚刚入睡我们刚刚入睡,就在这时就在这时铃声响了起来。铃声响了起来。 ( 2 ) He had scarcely arrived when he had to leave again. 他刚刚到达他刚刚到达，就就在这时在这时又要离开了又要离开了。2021/8/143即：即：when 用于以下结构中表示：用于以下结构中表示： “正在这时正在这时/那时那时”1.be doing . when . 正在做正在做.这时这时/那时那时.（另一个动作发（另一个动作发生了）生了）2.be about to do. when. 正要做正要做.这时这时/那时那时.（另一个动作发（另一个动作发生了）生了）3.be on the point of doing .when. 正要做正要做.这时这时/那时那时.（另一个动作发（另一个动作发生了）生了）4.had just done .when . 刚做完某事，这时刚做完某事，这时/那时那时.（另一个动作发（另一个动作发生了）生了）2021/8/1441. 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. wouldB2.We were getting in the wheat_suddenly it poured with rain.A. While B.when C.as D.beforeB3. She had just finished her homework_ her mother asked her to practice playing the piano yesterday. A. when B. while C. after D. since A2021/8/1454.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. whenAAD2021/8/1467.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. afterB2021/8/147部分资料从网络收集整理而来，供大家参考，感谢您的关注！