they go to school five days a week .a week前为什么不用in,这样的句子什么情况用in,什么时候不用

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they go to school five days a week .a week前为什么不用in,这样的句子什么情况用in,什么时候不用
they go to school five days a week .a week前为什么不用in,这样的句子什么情况用in,什么时候不用

they go to school five days a week .a week前为什么不用in,这样的句子什么情况用in,什么时候不用
不错的问题.通常时间用in表示.但有例外
说特别有规律的时间的时候就不加in.也就是说到每隔多长时间的时候.
比如；每三年 every three years
没有一次 once a week
你说的这句话,每周都是如此,也不加in,变成了 five days a week

five days a week 是固定搭配,表示时间的频率, 意为"每周五天", 不能用in.
当表示" 在某一周"或" 在...周之内'时,要用in,如:
There are seven days in a week . 一周有七天.
He'll be back in two weeks . 他两周之后回来.

时间段前面加in，表示在这段时间里面，比如I have to finish this task in a week.我必须在一个星期里完成这项任务。但是像这种“一周五天、一个月十天”表达为“five days a week, ten days a month ”是不加in的。

They go to school They go to school on foot.翻译 They ()(not go)to school on Sundays. they usually go to school by underground They go to school by bus同义两种They ( ) ( ) ( )to schoolThey go to school ( ) ( )bus They walk go to school .和 They are go to school on foot.有什么区别 they go to school （）monday （）they go to school （）monday （） friday. This is the way from my home to school.First go straight on.Then turn left at the fi They ususlly go to school From Monday to （They ususlly go to school From Monday to （） they go to school by bilk 对by bilk 提问---------------- ---------------they--------to school They go to school by bike.同义句转换 They go to school__ __ __. They go to school from Monday to Friday every week.（写出同义句）They go to school _____ _______ They 和They are的区别They go to school 和 They are go to school 有什么区别吗?什么时候用they 什么时候用 they are？ They go to school on foot.对on foot提问 They go to school every day.改为否定句 they go to school by bike对by bike提问 Children in China go to school when they are seven_____eight They often go to school by bike.同义句