We use this expression to emphasize agreement with something or someone.
You can use this phrase in ………… language.
Spoken
Written
Informal
Example 1
A: I was really tired when we got back from Singapore.
B: I bet you were. It’s a 18-hour flight, isn’t it?
Example 2
A: I wanted to buy tickets for U2, but I couldn’t.
B: I bet you couldn’t. They sold out months ago!