need to be clear about the purpose of your letter.
are you writing a letter?
Are you asking for something?
Will you be giving information?
Will you be offering to do something?
What issues should be addressed?
at these lines from letters. Which kind of letter do they
be happy to provide the data and a recommendation for you.
you be able to ... ?
following issues need to be addressed ...
for your letter of 5th May.
is to let you know that ...