Let me give you a piece of advice.
I want to buy this car. (我真想买这辆汽车。)
Let me give you a piece of advice. (我得提醒你一句。)
Let me tell you something.
I think you should know…小心!
Watch out! *用于有险情时，“危险!”、“留神!”、“小心!”。
Watch out! (小心!)
Thanks! You saved my life. (谢谢你救了我一条命。)
You'd better be careful!
Please be careful! (请多加小心!)
You should be careful! (你得多加小心!)
You should watch out! (你得留神!)注意脚下。
Watch your step! *用于提醒地滑，看不清楚楼梯等场合。常用于公共告示。
Watch your step! (注意脚下。)
Oh, yeah? Why? (噢?是吗?为什么?)
Mind your step.
Be careful where you walk.
Look where you're going.抓紧我。
Hold on to me tight.
Don't let go! (别松手!)
Hold me tightly.要提防着点儿他!
Watch out for him!
Watch out for him! (要提防着点儿他!)
Be careful of him.
Keep your eye on him.这里有点儿蹊跷。
There's a little catch. *“小心有陷阱，圈套”。
That sounds easy. (好像很简单。)
Well, there's a little catch. (可是，有点蹊跷。)
There's something to it.
It's not as easy as it sounds. (并不像听起来的那么容易。)三思而后行。
Think twice before you do it.轻拿轻放。/动作轻点儿。
Easy does it. *表示“要小心谨慎地处理”易碎品或贵重物。
Easy does it, doesn't drop the TV. (动作轻点儿，小心别把电视掉下来。)
Don't worry. I won't. (放心吧，掉不下来。)
Be careful. (小心啊!)