请帮我修改一下这篇作文（急用）

首先说明,这篇文章写得很烂,给这么点分帮你改实在是出于好心
My sister
My sister is a good girl ,but she has a little superstitious belief .for example ,one time for the sake of fun I just said that if I would fail this competitive examination for a collage admission before the university entrasnce examination.It is hard to image what she had done and said first ,as soon as I said these words her first reflect was seemed to I have did something extremely wrong thing then she went to window to watch the sky and both hands merded to say something to sky .i thought she was praying .You see that is she ,so superstitious person she is .
It is a matter of fact that she insanly likes watching tv .I never see that a girl can like watch tv so much.If she find a good tv serial ,she will watch it immediately.there is one time that she watch tv ever forgot to have lunch .so that is she who is really a couch potato.
改到这里我哭了,你写的实在是垃圾透顶,记住一句话,不能用中文的叙述方式写话,更不能把它直接翻译成英语,好好回去看语法书,再回头重写,MD
She has another character.if you go with her when you arrive the stairs she will let you go first ,even you don’t want to go first .but you do not feel strange this is just my sister is habit .maybe she thinks that is good for others to go first.it is more courteous for her to do like this.another character aslo the most imortant is that eveyone think her heart is in the right place.yes ,she is a very kindly girl .she is concered with me vevy much and we care for each ,too.Evey time she comes from college she will take some snack for me ,aslo sometimes some interest books about other countries.
Now ,this is my sister ,a litte superstitious belief ,a couch potato,a kindly girl.