You must be careful of your reputation.

你得注意自己的名声。

And you must be careful of falling stones.

你们还必须当心下落的石头。

Also, be careful of regional idioms.

还有，小心地域性的习语。

Be careful of the small details.

注意小细节。

The next verb to be careful of is be.

下一个要注意的动词是 be。

You should be careful of Dawn.

你应该提防Dawn。

Be careful of her cysts. She'll nip you.

小心她的包囊 她会咬你的。

On which subject...I should be careful of Thomas.

说到这个...我应该对托马斯加以小心。

We are careful of our language too – so, no swearing.

我们也注意我们的语言——所以，不要说脏话。

English has some irregular nouns which you need to be careful of!

英语有一些不规则名词需要你们注意！