-s: one book - two books, one pencil - two pencils, one rubber - two rubbers, one pen - two pens, one pencil case - two pencil cases, -es (-s/-ss/-ch/sh/x): one box - two boxes, one sandwich - two sandwiches, one dish - two dishes, one watch - two watches, one bus - two buses, one dress - two dresses,

Adding -s and -es rule (GG1, Unit 0)

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