be careful of是短语，是小心的意思；be careful of后面接动名词或者名词。
扩展资料
be careful的各种搭配：
1.be careful后跟about
be careful about sth讲究，小心，当心；慎重的，注意...的；对...小心
be careful about doing sth 慎重、小心、当心做某事
2.be careful后跟of
be careful of sth爱护、关切、挂念、呵护；当心、留意、注意
be careful of the traffic. 注意交通安全。
be careful of/as to wh-从句（of在后接wh-从句时常省略）
3.be careful后跟with
be careful with 小心处理；对…谨慎 ；节俭的`、节省的
be careful with the/your money花钱精打细算；吝啬、小气
be careful with小心火
4.be careful for关心、惦记
5.be careful in...在...方面、过程中小心、注意
