Prefixes: in-, il-, ir-, im-Another prefix meaning "not" or "the opposite of" is in-.
However the spelling of this prefix often changes to
match the first letter of the base word. This sometimes
results in a double letter.
So, if we want to say the opposite of legal we say
"illegal" instead of "inlegal" (which would be awkward
to get your tongue around!).
The pattern is like this:
*Use il- before words starting with l.
So not legible = illegible.
*Use ir- before words starting with r.
So not relevant = irrelevant
*Use im- before words starting with m but also in front
of words starting with p.
So: not mature = immature not perfect = imperfect.
1. Fill in the gaps in the following table. There are four
examples to get you started.