| -ible | -able |
| If the root is not a complete word, add ..-ible | If the root is a complete word, add ..-able |
| aud+ ible = audible | accept+ able = acceptable |
| Examples: | Examples: |
| visible | fashionable |
| horrible | laughable |
| terrible | suitablet |
| possible | dependable |
| incredible | comfortable |
| If the root is a complete word ending in -e, drop the final -e and add -able | |
| excuse - e+ able = excusable | |
| advise - e+ able = advisable | |
| Examples: | |
| desirable | |
| valuable |
Some exceptions:
contemptible
digestible
flexible
responsible
irritable
Spelling Exercise:
In the following sentences, the final four letters are omitted from each -ible or -able word. Complete each word with the appropriate ending.
1. Last night's movie about the invis____ man was so incred____ that it was laugh____.
2. My irrespons____ little brother is usually kept away from anything break____.
3. Are these new clothes really comfort____, or do people only wear them because they are fashion____?
4. I think I would be less irrit____ if my professors were more flex____.
5. I don't think voting twice in national elections is permiss____.
6. It's always valu____ to have a friend who is depend____.
7. My employer said that it isn't suit____ to have a secretary whose handwriting is illeg____.
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