(50)这篇英语作文有什么语法错误吗?请纠正一下,

题目

(50)这篇英语作文有什么语法错误吗?请纠正一下,
Trees help human a lot.They bring us oxygen and we get fresh air from trees and get relaxed.And trees have another way——The leaves of trees are green.Green color is the best color for our eyes.So we should not cut down trees and using fewer papers that they make from wood.We also should also grow more trees because trees are our best friends.

答案

我改的：Trees help human a lot.They can bring us oxygen.We can get fresh air from trees and get relaxed.What's more,the leaves of trees are green,which is the best color for our eyes.So we should not ...