Be careful not to damage other people's property.
小心別損及別人的財物。
It would be unfair not to let you have a choice.
不讓你有所選擇是不公平的。
Be careful not to cross the line.
小心別越過道路的中界線。
Be careful not to confuse quantity with quality.
注意不要把數量與質量混淆了。
Be careful not to drop that plate.
小心別把盤子摔了。