Be careful with that —it cost a lot of money.(小心別弄壞那東西，它可值錢了。)

You must be careful when handling chemicals.(接觸化學藥品必須小心謹慎。)

I think you should be careful about talking of the rebels as heroes.(我認為你還是當心點好，別把叛亂分子說成是英雄。)

Be careful, you're dripping paint everywhere!(小心點，你把顏料滴得到處都是。)

He really must be careful about thinking aloud. Who knew what he might say?(他真地得對自言自語小心點。誰知道他可能會說什么？)

Be careful what you say—he's easily provoked.(說話要小心，他這個人一惹就火兒。)

Be careful of the flu.(小心染上流行性感冒。)

Be careful and keep calm.(小心，保持冷靜。)

'I cooked it myself, so be careful!' he joked.(“我親自下廚做的，所以要小心點喲！”他開玩笑說。)

Be careful climbing that ladder. Look what happened last time.(爬那梯子時小心點兒。上次不就出事了么。)