>The exercise books are returned now as the teacher corrected them.
I wanted to know whether I can use the different tenses [present and past tense] in a sentence.
It's not a very good sentence. " There is no general prohibition on combining different tenses within a sentence; English allows numerous possibilities. It's just that yours is not a great example.
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It's not a very good sentence. I suggest something like:
"The teacher has corrected the exercise books, and the books have been returned."
There is no general prohibition on combining different tenses within a sentence; English allows numerous possibilities. It's just that yours is not a great example.