老师仔细检查了我们的作业。

Lǎoshī zǐxì jiǎnchá le wǒmen de zuòyè.

The teacher carefully checked our homework.

老师正在检查同学们的作业。

Lǎoshī zhèngzài jiǎnchá tóngxuémen de zuòyè.

The teacher is checking the students’ homework.