Here is some more practice at using the prefixes
in-, il-, im- and ir-

Remember, you use:
  • il- if the base word starts with l. For example not legal = illegal
  • im- if the base word starts with m or p.
           For example not mobile = immobile, not proper = improper
  • ir- if the base word starts with r. For example not relevant = irrelevant
  • in- if the base word starts with any letter other than l, m, p, or r. For example not adequate = inadequate
    See if you can choose the correct words in the following. Click on the button alongside a word to see if you're right.

    1. not literate
        inliterate     illiterate     irliterate

    2. not effective
        imeffective     ireffective     ineffective

    3. not perfect
        inperfect     imperfect     ilperfect

    4. not reversible.
        inreversible     irreversible     imreversible

    5. not legible
        inlegible     imlegible     illegible

    6. not eligible
        ileligible     ireligible     ineligible

    7. not relevant
        irrelevant     inrelevant     imrelevant

    8. not possible
        inpossible     ilpossible     impossible

    9. not responsible
        irresponsible     inresponsible     imresponsible

    10. not mature
        inmature     immature     ilmature

    11. not sufficient
        imsufficient     insufficient     irsufficient

    12. not logical
        illogical     imlogical     inlogical
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      Learning about prefixes will help your spelling and give you a greater vocabulary too.