教室中央有一个人正在睡觉。
In the middle of the classroom is sleeping a student.
鲸鱼这时正在睡觉，它的`嘴巴张得开开的。
The whale was sleeping, and its mouth was open.
我正在睡觉，有人串门来了。
When I was sleeping, someone dropped in on me.
那个小袋鼠多么可爱啊。它正在睡觉。
That baby kangaroo is so cute. It's sleeping.
它看到兔子正在睡觉但它并没有停止爬行。
It sees the rabbit is sleeping and doesn't stop.