看看这段英语有什么错误吗？

第一句前面：send 改为 sent，
第一句后面：you are make 改为 you are making
最后一句： Now， I tell you 改为 I am telling you 或 I am going to tell you

太小了啊~~

Dear Jack,
I learnt from your letter that you are making a social survey on people's view on friendship. Now, I'll tell you my point of view.

From your letter sent to me, I know you are making a social survey about people’sviews on friendship now. I tell you my point of view.

第一句改为：From the letter you sent to me 会比较好。

其余的同1楼。

According to your letter, I understand your made a social survey about the view of morden people for friendship.
now I will tell you my view about it.