1.保持教室干净是keep the classroom quiet还是keep quiet in the classroom.2.做晚饭是make dinner还是cook dinner3.night的介词是at,可为什么school night（上学日的晚上）的介词是on?
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1.保持教室干净是keep the classroom quiet还是keep quiet in the classroom.2.做晚饭是make dinner还是cook dinner3.night的介词是at,可为什么school night（上学日的晚上）的介词是on?
1.保持教室干净是keep the classroom quiet还是keep quiet in the classroom.
2.做晚饭是make dinner还是cook dinner
3.night的介词是at,可为什么school night（上学日的晚上）的介词是on?
1.保持教室干净是keep the classroom quiet还是keep quiet in the classroom.2.做晚饭是make dinner还是cook dinner3.night的介词是at,可为什么school night（上学日的晚上）的介词是on?
1）用keep quiet in the classroom,而keep the classroom quiet使教室安静,教室自身怎么能安静?keep the classroom clean倒可以,所以一般不这样用.
2）两者都可以,你可以在百度上找到相应的例句.
3）night前面本来就既可以用on,又可以用at,区别是at night只能表达某一个晚上,而on night泛指夜晚（也就是复数）
1keep the classroom quiet
2cook dinner
3at night是固定搭配，school night是指周一到周五的晚上具体的时间介词用on
keep quiet in the classroom
cook dinner
因为night前有修饰词school，所以用on，也可以说是固定搭配
明白吗
1.keep the classroom clean.是干净不是安静。
2.都可以。一般用前者。
3.night加定语就是要用On了。
1.keep quiet in the classroom.2.cook dinner 3.on school night,这是书上原句。
1.keep quiet in the classroom
2.cook dinner
3.题意模糊
上学日的晚上？