他的尺子在铅笔盒里。

His ruler is in the pencil-case.

youdao

这是我的钢笔，你的钢笔在桌子上，他们的钢笔在铅笔盒里。

This is my pen, your pen is on the table, and their pens are in the pencil case.

youdao

这是我的钢笔，你的钢笔在桌子上，他们的钢笔在铅笔盒里。

This is my pen, your pen is on the table, and their pens are in the pencil case.

youdao