How do I adjust the correct letter, already attached, and I'd appreciate if you are a foreigner who can speak Thai as well. I will be happy and willing to help.
I already corrected you by email attachment and I appreciate that you are a foreigner working in Thailand as well. I am happy and always willing to help
I'm the letter to you already, per file attached, and highly appreciated that you are a foreigner who can use the language better. I'm happy and willing to help.