General Rule:
* -able: Use this suffix for words derived from verbs.
* -ible: Use this suffix for words derived from Latin words.
Examples:
* -able:
* *Breakable* (from the verb "break")
* *Changeable* (from the verb "change")
* *Manageable* (from the verb "manage")
* -ible:
* *Visible* (from the Latin word "visibilis")
* *Audible* (from the Latin word "audibilis")
* *Flexible* (from the Latin word "flexibilis")
Exceptions:
* -able: Some words derived from Latin can also use "-able".
* *Suitable* (from the Latin word "sutabilis")
* *Saleable* (from the Latin word "salubris")
* -ible: There are a few words that use "-ible" but are not directly from Latin.
* *Invincible* (from the French word "invincible")
Tips for Remembering:
* Think "verb" for "-able."
* Think "Latin" for "-ible."
* Use a dictionary if you are unsure!
Here are some additional points to consider:
* Double Consonants: When adding "-able" or "-ible" to words ending in a single consonant, often double the consonant before adding the suffix:
* *Regret* + -able = *Regrettable*
* *Control* + -ible = *Controllable*
* "E" at the end of words: When adding "-able" or "-ible" to words ending in "e," often drop the "e" before adding the suffix.
* *Move* + -able = *Movable*
* *Sense* + -ible = *Sensible*
Let me know if you'd like more examples or have any other questions!