在學校或在上學用介詞：in school， at school都可以，舉例如下：
at school
a) in the school building 在學校
I can get some work done while the kids are at school.
b) British English 英國英語，求學 attending a school, rather than being at college or university or having a job:
We"ve got two children at school, and one at university.
in school
Sandra"s not in school today.
b) American English 美國英語 attending a school or university rather than having a job:
Are your boys still in school?
在學校或在上學用介詞：in school， at school都可以，舉例如下：
at school
a) in the school building 在學校
I can get some work done while the kids are at school.
b) British English 英國英語，求學 attending a school, rather than being at college or university or having a job:
We"ve got two children at school, and one at university.
in school
a) in the school building 在學校
Sandra"s not in school today.
b) American English 美國英語 attending a school or university rather than having a job:
Are your boys still in school?