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用when或while填空完成下列句子:1.i visited the museum of history —— i w

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用when或while填空完成下列句子:1.i visited the museum of history —— i was studying in shengyang
2.i took a photo of the alien ___it came out.3.students stopped talking __the teacher came into the classroom.4.____my mother was cooking,my father was sending e-mails on the computer.5.what happened ____the girl was shopping?[说清做题技巧,即when和while的区别】
1. while/when 2.when 3. when 4. While/When 5. when/while

when: 当...的时候, 其动词可用延续性动词(如:cook, shop ,study ),也可用非延续性动词(如: come ),
表示从句中的动作可发生在主句之前,也可与主句的动作同时发生.

while: 正当...的时候, 其谓语动词只能使用延续性动词(如:cook, shop ,study ),表示从句的动作与主句的动作同时发生.(如: 上面的 1, 4. 5 题). 从句中只能用进行时态.