be careful的各種搭配：
1.be careful后跟about
be careful about sth講究，小心，當(dāng)心；慎重的，注意...的；對(duì)...小心
be careful about doing sth 慎重、小心、當(dāng)心做某事
2.be careful后跟of
be careful of sth愛護(hù)、關(guān)切、掛念、呵護(hù)；當(dāng)心、留意、注意
be careful of the traffic. 注意交通安全。
be careful of/as to wh-從句（of在后接wh-從句時(shí)常省略）
3.be careful后跟with
be careful with 小心處理；對(duì)…謹(jǐn)慎 ；節(jié)儉的、節(jié)省的
be careful with the/your money花錢精打細(xì)算；吝嗇、小氣
be careful with小心火
4.be careful for關(guān)心、惦記
5.be careful in...在...方面、過程中小心、注意
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