“请你帮我寄桌上的那封信”的英文是什么？

Please help me mail the letter on the desk.

Please help me mail the letter on the desk、、、

Asks you to help me to send on the table that letter
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can you help me post the letter that is situated on the table

can you help me post the that's on the table

Please help me to send the table the lette

please send the letter on the table