初中when和while的用法
初中when和while的用法：when意为什么时候、当…时，是指具体的时间点，用作疑问副词，引导特殊疑问句，用作关系副词引导限制性定语从句；while意为虽然、然而、一会儿，是指某一段时间，常用来引导时间状语从句。
when的含义及用法介绍
1、作为副词时，意为什么时候;何时;什么情况下;什么场合下;(用于时间的表达方式之后)在那时;其时;当时;当场。
例句：When did you last see him?
你上次什么时候见到他的？
Sunday is the only day when I can relax.
星期日是我唯一可以休息的日子。
The last time I went to Scotland was in May, when the weather was beautiful.
我上次去苏格兰是在五月份，那时的天气好极了。
2、作为代词时，意为什么时候;何时。
例句：‘I've got a new job.’ ‘Since when?’
“我有了份新工作。”“什么时候开始的？”
3、作为连词时，意为在…时候;当…时;在…期间;在…之后;在任何…时候。
例句：I loved history when I was at school.
我上学时喜欢历史。
Call me when you've finished.
你完成后就打电话给我。
Can you spare five minutes when it's convenient?
方便时能占用你五分钟时间吗？
He had just drifted off to sleep when the phone rang.
他刚睡着电话铃就响了。
二、while的含义及用法介绍
1、作为连词时，意为在…期间;当…的时候;与…同时;(对比两件事物)…而，…然而。
例句：We must have been burgled while we were asleep.
我们睡着时一定让贼入室偷了。
You can go swimming while I'm having lunch.
我吃午饭时你可以去游泳。
While Tom's very good at science, his brother is absolutely hopeless.
汤姆很擅长理科，而他的兄弟绝对是不可救药。
2、作为名词时，意为一段时间;一会儿。
例句：They chatted for a while .
他们聊了一会儿。
I haven't seen him for quite a while .
我有好一阵子没有见到他了。
3、作为动词时，意为消磨;轻松地度过。
例句：We whiled away the time reading and playing cards.
我们靠看书和玩纸牌消磨时间。
最后总结，通过以上关于初中when和while的用法内容介绍后，相信大家会对初中when和while的用法有个新的了解,更希望可以对你有所帮助。
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