There are several approaches we can take depending on the person who is trying to learn it.
If I have a student who really struggles with spelling of even very common and simple words, then whether to use ‘-able’ or ‘-ible’ isn’t their greatest priority and I would use Hint 1:
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Hint 1: It is much more common for words to end in ‘able’ than ‘ible’. So if you don’t know and there’s no dictionary around, use ‘able’ – you’ve got about a 5:1 chance of being right!
But obviously that’s not good enough for some people. If I was teaching someone who had a reasonable knowledge of the English language I’d get them to look at some ‘-able’ and ‘-ible’ words and notice the following:
Hint 2: Generally we use ‘-able’ when a complete word remains (or just without a final silent ‘e’, or a ‘y’ changed to ‘i’) when we take the suffix away. So for example, ‘fashionable’ – ‘fashion’ is a complete word, so add ‘-able’. But ‘edible’ – ‘ed’ is not a complete word meaning ‘eat’ so it’s ‘-ible’. Of course (being English!) this isn’t always true but it’s a good guide. If that doesn’t help, try this:
Hint 3: Play around with the root word and see if you can make any words with ‘-ation’ with it. So if you don’t know if it’s ‘applicable’ or ‘applicible’, think of ‘application’. If you can make an ‘-ation’ word then it’s probably ‘-able’. So here it’s ‘applicable’. But if you play around with it and can only make an ‘-ition’ ‘-tion’, ‘-sion’, ‘cian’ or ‘-ion’ word it’s much more likely to be ‘-ible’. For example, it’s ‘visible’ because of ‘vision’.
This should satisfy most learners but let’s say I am teaching someone who has studied Latin or is a bit of a linguist. They are not usually the ones who come to me with spelling problems but if they do:
Hint 4: If the root comes from a Latin verb ending in ‘are’, use ‘able’. If it comes from an ‘ire’ or ‘ere’ word use ‘ible’.
Hint 5 is for anyone:
Hint 5: New words are often made with ‘-able’, but not ‘-ible’: ‘emailable’, biodegradable’, ‘clickable’, ‘offsetable’, ‘recession-proofable’. (I may have made the last two up but they are allowable!)