写作思路：作文要求介绍妹妹，写人的作文，要抓住妹妹的外貌、性格特征等描写。
正文：
Hello, everyone! I’m so glad to tell you something about my sister, whose name is Winnie.
大家好！我很荣幸能向你们介绍我的妹妹。她的名字叫温妮。
She is three years old. She has two big eyes with very long eyelash.
她三岁了。她有一双大眼睛，很长的睫毛。
And she has a small nose and a small mouth. She is very lovely. I like to play with her very much.
她有一个小鼻子和一个小嘴。她很可爱。我很喜欢和她一起玩。
When she is angry, she will cry, and she cries very loudly.
当她生气时，她会哭，而且她哭很大声。
Sometimes, she threw something if she wasn’t happy. It was very terrible then.
有时候，她不高兴的时候会扔东西。那时候很可怕。
One day, we were in a restaurant. I was sitting on a chair.
一天，我们在一家餐馆。我坐在椅子上。
Winnie wanted to sit in the chair which I was sitting in.I didn't want her to sit in mine, so she cried very loudly again.
温妮想坐在我坐的椅子上。我不想让她坐在我的座位上，所以她又大声哭了起来。
I gave up and let her sit. And she cried more loudly, she might think I wouldn't play with her anymore.
我放弃了，让她坐下。她哭得更大声了，她可能认为我不会再和她玩了。
At last, I comforted her, gave her something to drink, and she smiled throug tears.
最后，我安慰了她，给了她喝的东西，她笑得泪流满面。