Everyonehasalotofdreams.Somepeoplewanttoberich.Somepeoplewanttobefamous.（Somepeoplewanttoberichwhileotherswanttobefamous）.Ihaveadream,too.WhenIwasasmallchild（WhenIwasalittlekid）,IhadadreamthatonedayIwouldbecomeagreatpianist.Iwill（would）playthepianointheMusikvereininViennato（去掉to,改成and）makethebestmusicforthewholeworld.Whenlwasthreeyearsold,myparentshelpmepleaseateacher（myparentspaidateacherforteachingmeplayingthepiano）.Sheisverybeautifulandkind.Shetoldmehowtoplaythepianoandhowtomakethemusicsoundbetter.Whenllearnedtwomonthstime（Afterlearningabouttwomonths）,Ithoughtplaythepianoverydifficult（改成Ithoughtitisverydifficulttoplaythepiano）.Afterlearningmyarmsareveryacid（去掉这句,改成Ifeltmyarmsacid）,butIdidnotgiveup.Now,I’mtwelveyearsold.Istillwanttobeapianist.Ididalotforthedream（加上tobeapianist）andIspend（改成spent）morethantwohoursplayingthepianoeveryday.It’sveryhard,butIinsist（加上onpracticing）it（去掉）fornineyears.Nomill,nomeal.NowI（I’m）intheGradeExaminationofmusicallevelofcurrentyearfornonprofessionals（这句话我没懂你要表达什么,所以没改）andhavereachedthe9th.gradeintheplayingofPiano（如果你想表达的是：我现在已经达到钢琴九级的话应该这么写andhavereachedthequalificationforthegradenineinpiano-playing）.Pianoisakindofmusic（这句话你要表达什么呢?没懂,但你的表达方式肯定不对.）.Ithelpsmelearnsomethingof（of改成about）music.Becomeapianoplayisahardjob（Becomeapianoplayerishard）.Iwillbeharderandhardertopracticeit（Iwouldpracticeitharderandharder）.IbelieveIcandoit.

　　你后面写的有些表达不清,不能确定你要表达什么.

　　首先，很感谢您能帮我修改这篇作文。我仔细地看了您的回答，现在我还有几个问题想请教您（由于字数限制我将分多次追问，还望您能理解）：

　　1、myparentspaidateacherforteachingmeplayingthepiano我想问一下这里为什么用paid；

　　2、Becomeapianoplayerishard.这里become是否需要换成becoming；

　　抱歉啊，现在才看到你的追问。

　　1、paid是pay的过去式，你想表达的是你小时候父母给你请了一个老师，所以...

　　2、become改成becoming。（becomingapianist是主语，is动词，）