be good at / be good with /
　　be good to / be good for
　　be good 后接不同的介詞,表達(dá)的意思也不同.
　　1）be good at 意為“擅長……”,后接名詞、代詞或ving形式.例如：
　　I’m good at playing chess.
　　我擅長下象棋.
　　2）be good with意為“靈巧的；與……相處得好”.例如：
　　She is good with her hands.
　　她手很巧.
　　He is very good with the children.
　　他與這些孩子處得很好.
　　3）be good to意為“對……友好”.例如：
　　My friend was good to me when I was ill.
　　我生病時(shí)我的朋友對我關(guān)懷備至.
　　4）be good for意為 “對……有好處”.例如：
　　Eating more vegetables is good for your health.
　　多吃蔬菜對你的健康有好處.