Both are good.
However, I feel like if someone said “I have English class at 4” to someone else, I would get the impression that the receiver of this message already knows of the English class. But if someone said “I have AN English class at 4” to someone else, I would get the impression that the receiver of this message isn’t already aware that he/she takes English classes nor started taking them.
🌈 Nicky
February 8, 2023
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Both are fine.
The second is if you want to specify the quantity of classes.
February 8, 2023
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