前者是指放学后例：I meet you after school我放学后见你后者可以当形容词用。。例：This is an after-school activity这是课后活动。

跟着来，到来例句：I'll come after the meeting if time permits.

不是的

意思不同，after school放学后，after class 课外的,课后的。

Please do not loiter in one street after school.

放学后，请不要在街头徘徊。

I will walk home after school this afternoon.

今天下午放学后我将走路回家。

Parents often give their time to help with classroom or after-school activities.

家长经常抽时间帮助教务或其他课外活动。

Well-off families are ruled by calendars, with children enrolled in ballet, soccer and after-school programs, according to a new Pew Research Center survey.

皮尤研究中心的一项新调查发现，富裕家庭完全按日程安排行事，子女跳芭蕾、踢足球、参加课外项目。

您好！

不是的，After class是一节课结束了。而After school是放学了