Question

when and where i.e words we should use the sufix mis,-mal,-im,ir

Answer 1

Those are <b>prefixes</b>, not suffixes, aren't they? They come at the BEGINNING of words; here are some examples:

misplaced
misspelled
misstep

malevolent
malware
malady

immaterial
immerse
(2 different meanings in those two)

irrevocable
irretrievable
irresistible

Look up these words at http://www.answers.com and/or http://www.onelook.com

At OneLook, you can also search like this, including the asterisk:
mis*
mal*
im*
ir*

All of these four prefixes will give a word a negative meaning or an opposite meaning to what the root word means.