| A prefix is a syllable at the beginning of a word that changes its meaning. The prefix il, im, in and ir all mean not.
Examples:
Illogical means not logical or practical.
Impossible means not possible.
Invisible means not visible.
Irrelevant means not relevant or practical.
| prefix | | word | | New word | New meaning |
| im | + | mature | = | immature | not mature |
| im | + | prudent | = | imprudent | not prudent |
| im | + | provable | = | improvable | not provable |
| im | + | mortal | = | immortal | not mortal |
| im | + | perfect | = | imperfect | not perfect |
| prefix | | word | | New word | New meaning |
| il | + | legible | = | illegible | not legible |
| il | + | literate | = | illiterate | not literate |
| prefix | | word | | New word | New meaning |
| ir | + | relevant | = | irrelevant | not relevant |
| ir | + | rational | = | irrational | not rational |
| prefix | | word | | New word | New meaning |
| in | + | adequate | = | inadequate | not adequate |
| in | + | capable | = | incapable | not capable |
| in | + | decent | = | indecent | not decent |
| in | + | offensive | = | inoffensive | not offensive |
Directions: Choose the prefix that should be added to the root word given in each question to form a correct word. Also, write five example words and sentences using each of the prefixes 'il', 'im', 'in', and 'ir'.
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