求高手把下段短文译成标准英文!!!急!

曾经,我和我几个好朋友感情很好,我们的友谊很纯真,放学一起玩,下课围在一起聊天.很开心. Once，I had several good friends,our friendship is very pure,we played after school,chatted after class,it's so happy.

但有时还会欺负班上的同学,可能因为这样,我们在班上就形成了一种势力. Bur we had a bully with other classmates,so ,we became a bad power in our class.
久而久之,我发觉大家都变了 ..And then ,I found we are changed.

我们知道,我们还是学生,要把学习放在第一位, We knew that we are also students,our first duty is study.

但她们至今仍然心思没有在学习上,而是在想着怎么玩才开心,But they have no mind in study nowdays,they are still care how get happy as usual.

我为她们感到很恼苦,也感到很伤心... I fell sad and worried with them....
我妈妈命令我不要和她们玩, 我也答应了. My mother order me not play with them.and i promised.
后来,我离开了这段友情. At last,i give up it.

后来,我的成绩进步的很快,也从而明白了.交朋友要交益友,因为这个问,题会影响你的人生.Then ,my study has a big advance,and i understand that choose good friend is a important point in your life,because it has deep influence.

Once, I and my feelings of a few good friends