Spelling words with the -ible suffix

The suffix -ible is common if a complete root word cannot be heard before it, e.g. legible, invincible. If there is an obvious root, the suffix -ible usually follows stems ending in an 's' sound e.g. response - responsible. Removing the -ible suffix does not usually leave a recognisable root word in English, e.g. visible - vis. Adjectives ending in the suffix -ible and adverbs ending in the suffix -ibly are connected in spelling and meaning. How to spell the curriculum words: definite and immediate.