Common suffixes taught in Phase Six:

-s and -es: added to nouns and verbs, as in cats, runs, bushes, catches;

-ed and -ing: added to verbs, as in hopped, hopping, hoped, hoping;

-ful: added to nouns, as in careful, painful, playful, restful, mouthful;

-er: added to verbs to denote the person doing the action and to adjectives to give the comparative form, as in runner, reader, writer, bigger, slower;

-est: added to adjectives, as in biggest, slowest, happiest, latest;

-ly: added to adjectives to form adverbs, as in sadly, happily, brightly, lately;

-ment: added to verbs to form nouns, as in payment, advertisement, development;

-ness: added to adjectives to form nouns, as in darkness, happiness, sadness;

-y: added to nouns to form adjectives, as in funny, smoky, sandy.

The spelling of a suffix is always the same, except in the case of -s and -es.