1、一般来说be careful of=be careful about
理解为小心、对什么谨慎、注意、表示注意自己健康等的方面。
2、Be careful abou强调的是要当心、小心,对..提高警惕
Be careful of强调对...认真,细心,小心（比较褒义）
3、例句：
She is careful about/of her food.=She is careful about/of what she eats.
她很注意饮食.
You are very careful of your work.
你对你的工作很谨慎/认真
扩展资料：
be careful + with + 名词 注意处理...
例句：Be careful with the vase; it's valuable.那花瓶很贵,要小心处理.
此外,还有be caregul (not)to do/that...通常与否定的内容连用
例句：Be careful not to be late.=Be careful (that) you don't be late.
小心不要迟到.
维基先生Wiki
