mr

l would be happy if u can tell me how to write a formal letter to my boss, asking him to change my contract from fulll time to part time.

[Niall]

If you are after a template, here goes:

Your Address
Date

Name and Title of whom you are writing to
Their Address

The Subject of the Letter (in this case: a change in working hours)

Dear NAME,
Your suggestions and requests (the main body of the letter).

Yours faithfully,
Your Signature
Your Name