care about关心、喜爱的意思.
care for则是有宠爱般的关心.
take care of照顾,关心,也有保重的意义.
careful和carefully则是形容词与副词的变化,careful是形容词,加ly变副词.
而careless是词根的否定后缀,有"不小心的,不慎的,无心的.”意思.
楼主懂么?