ADJECTIVES AND PREFIXES

As we've learnt today, we can form the opposite of an adjective by adding a negative prefix.

These are the most common negative prefixes used with adjectives:

dis-	il-	im-	in-	ir-	un-
disrespectful	illegitimate	impossible	indecent	irrelevant	unreasonable
dissatisfied	illogical	immature	incapable	irregular	unfortunate

Other negative prefixes are:

a-	anti-	countrer-	mal-	non-
amoral	antisocial	counterproductive	malcontent	non-violent
asexual	anti-aircraft	counterfeit	malnourished	non-profit

The prefixes im- il- and ir- are in fact a variety of in-:

• im- is used before words beginning with m or p: impersonal, immortal.
• il- is used before words beginning with l: illegal.
• ir- is used with words beginning with r: irregular.
   
   
  Here you can find some links with activities to practise word formation.

http://www.expandyourvocabulary.com/personality2/exercise4.swfWhich negative prefix?

ADJECTIVES FORMATION