What's he like? I bet he's really dreamy.

他长得如何？我敢说他一定很俊。

《牛津词典》

I bet he forgot about the meeting.

我打赌他已经忘记了这个会议。

youdao

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。

《柯林斯英汉双解大词典》

I bet he's smart. Is he smart?

VOA: standard.other

And so he gets in the backseat and he says, "I bet you can't guess who I am."

他坐在后座里，然后说:“我打赌你猜不出我是谁。”

记忆犹新的乘客 - SpeakingMax英语口语达人

Anyways,I will risk forty dollars and bet you that he can jump farther than any frog in Calaveras County."

VOA: special.2009.08.29

We didn't ask him, but I bet he has a composting toilet.

BBC: Newsnight's clock ident

"I bet he'd be awesome, " Stewart said.

WSJ: Those Wacky Yankee Lineups

Or that it is really "her" laptop, I bet money he is the one who paid for it!

FORBES: Video Of Dad Shooting Daughter's Laptop Goes Viral - But Is It Child Abuse?