正确的用法是in the school 还是 in school?

正确的用法是in the school 还是 in school? 请问in school,at school,in the school和at the school的用法, in the school 和in school 以及at school的用法及区别是什么, fly in sky还是fly in the sky?两个短语哪个是正确的用法? in the middle of the school is a big playground（中of的用法） With the increase in city population这种用法是否正确,正确的是哪种 关于blame的用法___ for the break down of the school computer network,Alice was in low spirit .是填To blame还是Blamed 为什么? in the past的用法 at school和at the school和in school 和in the school 的区别 My brother and I aer in the same school和I and My brother are in the same school哪句是正确的? We’re（）to study History in the middle school.We’re（）to study History in the middle school.A.go B.going 选择正确的答案 be the same as 的用法正确 school with students counted in the thousands这句怎么翻啊?我想大概意思是“数以千计学生的学校”吧.可counted in the thousands是什么用法啊 at school和in the school怎么区别,用法有何不同英语中诸如此类的介词用法怎么用?比如at the pinic为什么用at 而不用in.on my party为什么不能at my party? There are too many people in the school.为什么要用many?有类似用法的吗？ join the school volunteer projectjoin 能换成take part in?为什么?解释清楚.谢谢不要告诉我这两个的用法 哪种英语用法是正确的,为什么?He looks upon as one of the best piano players in the world和He is looked upon as one of the best piano plays in the word 两句之间只有被动语态的区别么?第一种用法是否正确? 英语,以下哪句句子是正确的?1.My best friend in primary school was Lucy.2.My best firend's name in primary school Lucy.3.The name of my best friend in primary school was Lucy.4.the girl name's Lucy.其他的为什么不正确