Go for the first prize! i know you are good enough.

争取拿头奖，我知道你行。

That's for sure.

那是当然。

Keep to the rules, and nothing can go wrong.

按规矩办事情就不会出差子。

I hate to bring this up, but this is a nonsmoking zone.

对不起提醒一下，这儿是禁烟区。

I think you are getting off the subject. Could we get back to the main point, please?

我觉得你跑题了。 我们能不能回到主题上来？

I am not getting what I bargained for.

当时说好的可不是这个样子。