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Grade 5 - English Language
Prefixes - Il, Im, In, and Ir

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.

Illogical means not logical or practical.
Impossible means not possible.
Invisible means not visible.
Irrelevant means not relevant or practical.

prefixwordNew 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

prefixwordNew word New meaning
il + legible = illegible not legible
il + literate = illiterate not literate

prefixwordNew word New meaning
ir + relevant = irrelevant not relevant
ir + rational = irrational not rational

prefixwordNew 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'.