Sure, here are 12 versatile English phrases that can be used in letter writing:
1、"I am writing to inquire about..."
2、"I would like to express my gratitude for..."
3、"In response to your recent inquiry..."
4、"I am pleased to inform you that..."
5、"Please accept my sincerest apologies for any inconvenience caused."
6、"I am writing to follow up on our previous discussion about..."
7、"I would like to bring to your attention the following matter..."
8、"Thank you for your prompt attention to this matter."
9、"I look forward to receiving your response at your earliest convenience."
10、"I appreciate your assistance in this regard."
11、"I would like to request further information regarding..."
12、"Should you require any additional details, please do not hesitate to contact me."
These phrases cover a range of purposes in letter writing, from inquiries to expressions of gratitude, and from apologies to requests for further information.