I hope you're fine.	a
How are you?	a
How are you doing?	d
It was good to hear from you.	g
Thanks for your letter.	g
Sorry I haven't written for so long.	d
I'm writing to tell you..	j
I wonder if you remember/have heard..	k
As for my latest news,..	l
First/Secondly, we're going to..	g
The plan includes..	m
I'm writing to ask for your help/advice..	p
I wonder if I could ask you to/for..	k
Could you tell me..	j
I'd be really grateful if you could..	l
I'm writing to thank you for..	m
Thank you so much.	n
It was (so/really) very kind of you to..	b
I'm really sorry that..	j
It will never happen again.	k
Sorry for any trouble/bothering you again.	m
Would you come to..?	n