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16.11: Lesson Thirty-five

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More About -able and -ible

1. In the previous lesson you saw that stems that form nouns with <ation> take -able to form adjectives. In the Verb column list the verb from which each adjective is derived:

Verb Adjective
appreciate appreciable
calculate calculable
communicate communicable
demonstrate demonstrable
equate equable
estimate estimable
navigate navigable
negotiate negotiable
penetrate penetrable
remediate remediable
separate seperable
venerate venerable
anticipate anticipatable
circulate circulatable
create creatable
indicate indicatable
locate locatable
translate translatable

5. Do verbs that end in -ate take -ible or -able? -able

That gives us our second useful generalization: Verbs that end in <ate> take -able to form adjectives.

3. In the Verb column list the verb from which each adjective is derived:

Verb Adjective
classify classifiable
deny deniable
envy enviable
justify justifiable
levy leviable
magnify magnifiable
modify modifiable
multiply multipliable
notify notifiable
pity pitiable
rely reliable
vary variable

Which do verbs that end in <y> take to form adjectives, -ible or -able ? -able

Notice that if a verb that ends in <y>, like deny, took -ible, the <y> to <\mathrm{i}> change would lead to ^*deniible, which wouldn't work since we avoid <ii> in English. If we deleted one of the <\mathrm{i}>'s, we'd get ^*denible, which doesn't fit the pronunciation because it leaves one vowel sound unspelled. So -able must be the logical choice.

That gives us our second useful generalization: Verbs that end in <y>. take -able to form adjectives.

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Feb 23, 2012

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