1. That reminds me
2. Why don't we...
3. I'd better get going...
4. Thanks for your letter...
5. Please let me know...
6. I'm really sorry...
7. Love,
8. Could you do something for me?
9. Write soon...
10. Did you know that...
11. I'm happy to hear that...
a) to finish the letter
b) to apologize
c) to thank the person for writing
d) to begin the letter
e) to change the subject
f) to ask a favor
g) before signing the letter
h) to suggest or invite
i) to ask for a reply
j) to ask for a response
k) to share some information