I don't know for sure. 我不确切知道。
Stranger： Could you tell me how to get to the town hall?
Tom: I don't know for sure. Maybe you could ask the policeman over there.
I'm not going to kid you.我不是跟你开玩笑的。
Karin： You quit the job? You are kidding.
Jack: I'm not going to kid you. I'm serious.
That's something. 太好了，太棒了。
A: I'm granted a full scholarship for this semester.
B: Congratulations. That's something.
Brilliant idea! 主意真棒!这主意真高明!
Do you really mean it? 此话当真?
Michael：Whenever you are short of money, just come to me.
David: Do you really mean it.
You are a great help. 帮了大忙
I couldn't be more sure.我再也肯定不过。
I am behind you.支持你。
A: Whatever decision you're going to make, I am behind you.
I'm broke. 我身无分文。
Mind you! 注意!听着!(也可仅用Mind。)
Mind you! He's a very nice fellow though bad-tempered.
You can count on it.尽管相信好了，尽管放心。
A：Do you think he will come to my birthday party?
B: You can count on it.
I never liked it anyway.我一直不太喜欢这东西。
Oh, don't worry. I'm thinking of buying a new one. I never liked it anyway.
I may go to the airport to meet her. But that depends.
It's a deal. 一言为定。
Harry： Haven't seen you for ages. Let's have a get-together next week.
Jenny: It's a deal.