Description

8 steps: (1) Most nouns: add -s. cat→cats, dog→dogs, book→books. (2) Words ending in s, x, z, ch, sh: add -es. box→boxes, bus→buses, dish→dishes. (3) Words ending in consonant+y: change y to i, add -es. baby→babies, city→cities. (4) Words ending in vowel+y: just add -s. boy→boys, day→days, key→keys.

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