1. The exercise books are returned as the teacher corrected them.
2. The exercise books was returned as the teacher had corrected them.
Which is correct?
1. The exercise books are returned as the teacher corrects them. 2.
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1. The exercise books are returned as the teacher corrects them.
2. The exercise books were returned as the teacher corrected them.
Those two are both correct. The first is a general statement; the second refers to the past.