My best friend is Mike.
我的好朋友是Mike
(你没说你的好朋友的名字.只好写你的名字了.文中不用出现你的名字.因为是你介绍你的好朋友)
She is a clever girl.She's very friendly to me.So we are being best friend.
她是一个聪明的女孩.她对我非常友好.所以我们成为了好朋友.
She's very fit,and taller than me.She has a big eyes,and she is a beautiful girl.
她非常苗条,还有比我高.她有一双大眼睛,她是一个漂亮的女孩.
She is a sports fans,and be keen on swimming the same as me.She swims better than me,but I study better than her.
她是一个运动迷,和我一样热衷于游泳.她游泳比我好,但我学习比她好.
We always study everthing together,and we have the same dream,being a great people.
我们常常一起学习任何东西,还有我们有同一个梦想,成为一个伟大的人!
That's the reason for we are best friend.
这就是为什么我们是最好的朋友.
And she will be my best friend forever.
她会是我永远的好朋友.
以上绝对不是用任何网页或工具翻译的,初中水平.