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.
not literate= illiterate not rational= irrational
not mobile = immobile not proper = improper
not legitimate=

 not regular=

not modest =

not personal =

not mortal =

not responsible

not possible =

not logical =

Use in- before any other letter. So: 
not adequate = inadequate        not capable = incapable
not decent  = indecent        not offensive = inoffensive  

Click here for the answers, here for a relevant Hangman Puzzle,
here for an interactive quiz on these prefixes and here for a Wordle revision list
Click here for the answers, here for a relevant Hangman Puzzle,
here for an interactive quiz on these prefixes and here for a Wordle revision list

2. Now memorize the focus words.

Spelling it Right

Roger Smith
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Focus words

illegible

illiterate

irrelevant

irrational

immature

imperfect

inadequate

incapable

indecent

inoffensive