自我介绍：

　　Hello!Everyone,mynameisSiyuan.Iamseventeenyearsold.Iamasonboy/girl.Ialwayseatsnackafterschool.Myfavouritecolourisbule.Myfavouritefoodishamburgars,icecreamandchicken.IamagoodstudentintheschoolandIamagoodsoninmyfamily!

　　Thisisme!

　　写老师的：

　　OurEnglishteacher,MrsWang,isaboutfortyyearsold.Shealwayswearsapairofglasses.Sheisverystrictwithus.Whenwemakeamistake,sheoftenmakesusstandup.Butwehearthatherhomeisfarfromourschool.Everymorningshehastowalktoschoolforfortyminutes.Andsheisneverlate.ThenwecometoseethatMrsWanglovesusdearly.Sheteachesussocarefully.

　　Infact,sheisagoodteacher!

　　（你再检查一下有没有语法错误,我刚上初一,才写的这篇作文,不过和这篇不太一样,不过我已经很用心在写了）