首先先说下,a是单数,people往往都是复数的用法啊,不可能在一起啊,要么是agreatperson,要么是agreatman,其次,没有说是哪个阶段的作文,多少字的,只好给你一个将就下吧.

　　Ithinkheisgreat,andIwanttodescribehim,youcanguesswhoheis.Heisagoodbasketballplayer.Heisverytall;heis7feet5inches.Hewasborninthe12thofSep.in1980,nowheis29yearsold.Hecanplaybasketballverywell,sohewaspitchedontoplaybasketballinNBAin2002,nowheisasuper-starinNBA,alsoheistheonlyChineseplayerinNBA.Ilikehim,becausehehastheworkmanlikemethods;hecanshootaccuratelythatsortofthings.

　　maybeyouhaveknownhisname,withoutdoubt,heisourstar,agreatpersoninmyheart---YaoMing.