สำหรับประโยคลงท้ายจดหมายธุรกิจ ผมมักใช้ประโยคแบบนี้
1. We would greatly appreciate your reviewing the agreement and sending it back to us as soon as possible. หรือ
2. We would deeply appreciate your prompt reply in this matter. หรือ
3. We look forward to doing business with you. หรือ
4. We look forward to continuing to do business with you.