NCO Primary Leadership Subjects
Adding Prefixes and Suffixes, Continued
Sometimes the base word tells whether to spell the word with -ible or -able.
-Ibie or -able?
continued
If the base word...
Then spell the ending
Examples
with...
-able.
is a full word
detestable
available
creditable
ends in e, drop the e
-able
excitable
desirable
ends in i,
-able.
justifiable
sociable
appreciable
reliable
-ible.
is not a full word,
audible
divisible
credible
possible
ends in ns or miss,
-ible.
Admissible
permissible
sensible
comprehensible
plus -ion forms a
-ible
digestible (digestion)
exhaustible
word,
(usually).
(exhaustion)
corruptible (corruption)
Writing Mechanics and Composition
1-15
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