英语改错this is a kind of animals -manatees.they are very big,th

英语改错
this is a kind of animals -manatees.they are very big,the ever age mantees is about ten fit long ,and weighes about 1000 pounds,you might in a great surpise,yeah, they are huge,but they are indarged.because the swamps have become polluted.and sometimes there isn't enough food all off them .so there are only 2500 of them.they lives in water under treesin mangrove swamps,then we should save them .but how to do it?

1. 大小写及标点问题可能是手误,已更正.
2. 单词拼写错误：
fit —— feet（英尺）；weights —— weigh（动词：重）；ever —— everu（每一头）；surpise —— surprise（惊奇）；indarged —— enlarged（扩大的）；off —— of
3. 语法错误：

1）This is a kind of animals-manatees. (主语是this,另外a kind of 表示有一种,改用单数animal泛指种类)
2）The ever age manatees is about ten fit long, and weighs about 1000 pounds. (复数的The ever age manatees 改为单数的every aged manatee)
3） You might in a great surprise, yeah, （句中缺谓语动词,in surprise不能加 a,改为 You might be in great surprise）
4）they are huge, but they are indarged,because the swamps have become polluted. （根据沼泽地被污染,推断出海牛所以 huge,其中污泥裹身把它们 enlarged也是一个原因）
5）And sometimes there isn't enough food all of them,so there are only 2500 of them.（for all of them）
6) They lives in water under trees in mangrove swamps, then we should save them. (改为they live in the water…)
7) But how to do it? 改为 how should we do with it
4. 修改后的全文如下：
This is a kind of animals-manatees. They are very big. Every aged manatee is about ten feet long, and weighs about 1000 pound. You might be in great surprise, yeah. They are huge, but they are enlarged,because the swamps have become polluted. And sometimes there isn't enough food for all of them, so there are only 2500 of them. They live in the water under trees in mangrove swamps, and then we should save them. But how should we do with it?