Is this correct?
The teacher got angry when he saw me resting my chin on my hand during the class.
If you are talking about a specific class that has been mentioned, yes. If not, it's better to say "during class" instead. The rest of it is fine.
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If you are talking about a specific class that has been mentioned, yes. If not, it's better to say "during class" instead. The rest of it is fine.