be strict with, be strict about, be strict in区别和例句解析如下：

1.be strict with sb. 对某人严格要求

（with后面通常接sb.而不是sth.）

Is Ms Chapman strict with her students?

查普曼女士对她的学生严格吗？

David is strict with his daughter because he cares about her.

大卫对他的女儿严格是因为他关心她。

Lily’s grandfather was more strict with her than her grandmother.

莉莉的爷爷比她的奶奶对她更加严格。

2.be strict about sth. 对某事要求严格

（通常不是主语自己在做的事）

Mr Black is strict about students’ homework.

布莱克先生对学生们的作业要求严格。

Her parents’ weren’t strict about her studies.

她的父母对她的学习要求不严格。

The old lady used to be strict about manners.

这位老妇人之前对礼仪严格要求。

3.be strict in (doing) sth. 在某方面（做某事时）严格要求

（通常是主语自己在做的事情）

Professor Li is strict in his study.

李教授对他的教研严格要求。

Our manager is very strict in his work.

我们的经理对他的工作要求很严格。

The young lady was strict with herself in everything.

这位年轻女士在每件事上都对自己严格要求。