to the noun.
book books pen pens
With nouns
ending in –s, -sh, -ch, -x or –o, we add the suffix –es.class classes
box boxes
arch arches
tomato tomatoes
Rules
With nouns ending in a consonant and –y, the –y goes and we add –ies.
country countries
baby babies
With nouns ending in –f or –fe, the –f or –fe goes and we add –ves.
knife knives
leaf leaves
