* Direct Object: The direct object is what the verb directly acts upon. In this case, the verb is "read" and the direct object is "a proverb". The teacher is reading something, and that something is a proverb.
* Indirect Object: The indirect object is the recipient of the direct object. In this case, the teacher is reading the proverb "to the students". The students are receiving the proverb.
Here's the sentence with the objects highlighted:
The teacher read students a proverb at end class.