Here's an example:

The name and designation of the man concerned:

Company name

Sir,

I am writing this letter to request you to kindly consider raising my salary. In this regard I am submitting the following few reasons for your kind and sympathetic consideration.

That i was appointed in your company as a..........nearly ........years ago, on a salary of ..........per month. During these .....years I have been working very hard  and now I am more or less doing every nature of work in the firm. Inspite of the various jobs which i have been recieving my salary continous to be only .......... per month. I an supporting a large family and high rent for accomodation and it is not possible for me to make both ends meet with this meager salary.

Under these circumstances I would request you to kindly give me immediate and adequate raise in my salary.

Hoping to get a favourable and early reply in the matter.

Yours respectfully,

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I hope that this letter will do you good, coz sometimes other superiors get intimidated by letters of requests... Goodluck!

"There's nothing we can do to change the past, if it teaches  you a lesson profit from it then, forget it."