下雨天要小心地滑。

Xiàyǔtiān yào xiǎoxīn dì huá.

Be careful not to slip on rainy days.

这个人不老实，小心被骗。

Zhège rén bù lǎoshi, xiǎoxīn bèi piàn.

This person isn't honest, be careful not to be cheated.

路上很多车，要小心过马路。

Lùshang hěnduō chē, yào xiǎoxīn guò mǎlù.

There are many cars on the road, so be careful when crossing the street.