大家好,我的名字是海倫,今年15歲.我喜歡聽歌,看書,我最喜歡的書是哈利波特并且七本都看過.我最喜歡的科目英語,因?yàn)橛⒄Z相對(duì)比較簡單.在未來,我認(rèn)為我會(huì)成為一個(gè)老師.我的座右銘：是一次只做一件事,做到最好!

Hello everybody!my name is Helen, I'm 15 years old.my favorite things include listen to music and read books. the book I loved most is Hally Botter,and I fininshed the reading of all seven books of its series.
My favorite subject is English, because I think it is comparely simple,and interesting .As for my future,I think i'd like to be a teacher.and my motto is as follows：one time just do one thing,and try your best to be perfect.
幫你潤色了一下,還加了修飾詞、連接詞,用了高級(jí)從句類型,希望你能采納.