"Would of " , "could of", "should of" ???

Recently I have run across the use of " would of", "could of", "should of" used in a sentence,

when it should have been "would have", "could have", and/or "should have"

This seems to be a very common mistake made when speaking as well as when writing.

I "could of" been a better writer if I "would of" learned to use English grammar properly.

The right way would read...I "could HAVE" been a better writer if I "HAD" learned to use English

grammar properly.

By : tatank,