Thesubordinateadverbof"careful"is"carefully"."Careful"isanadjectivethatmeanscautious,deliberate,orwell-planned.Forexample:"Heiscarefulinhisspeech."whichcanbetranslatedas"他说话谨慎."Somephrasesusing"careful"include:1.carefulanswer-谨慎的回答2.carefulexamination-仔细调查3.carefulman-细心的人4.carefulplan-彻底的计划5.carefulreading-精读.Synonymsfor"careful"include"thoughtful"whichmeansdeepinthoughtorconsiderate.Forexample:"Theyounggirlinthepicturehasathoughtfulandsolemnexpression."whichcanbetranslatedas"画中年轻女孩带着一副沉思而又严肃的神态."Somephrasesusing"thoughtful"include:1.thoughtfulessay-有思想性的文章2.thoughtfulfriend-关心别人的朋友3.thoughtfulaboutthebusiness-注意业务4.thoughtfulfor-关心，注意5.thoughtfulofothers-体贴别人.