I bet = I am certain
我确定：表示对某件事情非常有把握，毫无疑问。
- I bet $20 on a horse called Premonition. 我在那匹名叫“预言”的赛马身上下了$20的赌注。
- What's he like? I bet he's really dreamy. 他长得如何？我敢说他一定很俊。
- I bet he let slip that I'd gone to America. 我确信他无意中说出了我已去了美国。
- I bet Sue gave you an earful when you got home. 我敢说你到家时苏肯定数落了你一番。
- I bet you were good at games when you were at school. 我敢说你上学时很擅长比赛。
- I bet she was annoyed at having to write it out again. 我敢说她对不得不重写一遍感到恼火。