You bet is a casual of course, absolutely, no doubt about it: A: Can you cover my shift? B: You bet! In American English it's also a reply to thanks, meaning you're welcome, any time. It sounds friendly and upbeat; in a formal email, certainly or you're welcome works better.
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question / request → You bet!; thanks → You bet. (US)
- A: Would you watch the final again? B: You bet!
- A: Can you cover my shift on Saturday? B: You bet. I'll be there at nine.
- A: Thanks for carrying those boxes. B: You bet. Happy to help.
What changed
First versionA: Could you save me a seat? B: I bet!
RevisionA: Could you save me a seat? B: You bet!
Bet is about betting, so it can seem not to matter who's doing it. But I bet in reply to a request means I'm sure, or even a mocking yeah, right, not a promise to help. Agreeing is You bet!
I bet she's tired is a confident guess: she's probably tired. An ironic I bet! means yeah, sure, I don't believe you. You bet! is a happy of course in reply to a question or a request.
Your turn
A: Can I count on your help tomorrow? B: ___! I'll arrive early.
Show the answer
You bet — The person promises to help and come early, so they need the agreement You bet! I bet would sound like a guess or irony.
Reply to a friend who asks for a small favour. Start with You bet! and say what you'll do.
You bet! I'll pick up your parcel on my way home.
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