帮我看看2,3句英文有没有语法错误,快After I read your letter you told me that my dvd was damaged,then I went to the post office and send a new one.Because I am in China now,so the EMS will take few days to Chicago.Please waiting for that.

我的意见是：
Since i'm in China, it will take a few days to Chicago.Please wait for that!
Thank you so much!
"since"有时可以解释为“由于”“it will take + some time+ to do sth.”是一个句型“花费一些时间去做某事”
since 这是一封寄往国外的信，客气一点是有益无害的！！
祝你顺利换回dvd!!

I have read your letter,It tells me that my dvd was damaged.I went to the post office and send more one again，in time.I am in China now,so the EMS will be late.please waiting some days, Happy to you!
用过去完成时表示已完成的动作。
我已经读过你的来信了，你说我送给你的DVD光盘已经损坏了，我及时的到邮局再给你寄了一张，我现在在中国，所以EMS将会迟些到达，请你等些日子。祝你快乐。

修改：In your letter you said the DVD you had received was damaged, then I've sent a new one. Because I am in China now, the EMS will take a few days to Chicago. Please wait.

语法王来了。
-then- I went to the post office and -sent- a new one. Because I am in China now, so- the EMS will take few days to Chicago. Please waiting- for that
没有then,sent,没有so,wait,

别扭啊 别扭
In your last letter you said my DVD was damaged.So i went to the post office and sent a new one to you.Because i'm in china now,so it will take a few days to reach chicago.i hope you could wait patiently

是申请出国的材料出了一些问题吧 信里面有一些不大好的地方显得很chinglish,整段帮你改改吧
After I read the letter which said my DVD was damaged,I went to the post office to send you a new one.EMS will take a few days to Chicago from China,Please wait for that.Thank you.

最好在第一句的letter后面加上个in which,
send-sent
because去掉
will-may
few-a few(few表示否定,指几乎没有)
waiting-wait

because 和so 不能同时出现
去掉so