Do I need comma in this sentence?
Don't forget, Tom is a liar
You don't need a comma. But you do need some punctuation. You have two independent clauses. In the first, you have an imperative. The subject is an implied you. An independent clause is a complete sentence, so you can use two periods.
Don't forget. Tom is a liar.
You can join two independent clauses with a semicolon. We generally only use the semicolon when the two independent clauses are very closely related. That is the case here.
Don't forget; Tom is a liar.
You can also use a dash between the two in informal situations. Again, that is the case here.
Don't forget - Tom is a liar.
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