A noun names a person, place, thing, or idea.

Usually, the first page of a grammar book tells you about nouns. Nouns give names of concrete or abstract things in our lives. As babies learn "mom," "dad," or "milk" as their first word, nouns should be the first topic when you study a foreign language. 

For the plural form of most nouns, add s.

bottle – bottles
cup – cups
pencil – pencils
desk – desks
sticker – stickers
window – windows
For nouns that end in ch, x, s, or s sounds, add es.

box – boxes
watch – watches
moss – mosses
bus – buses
For nouns ending in f or fe, change f to v and add es.

wolf – wolves
wife – wives
leaf – leaves
life – lives
Some nouns have different plural forms.

child – children
woman – women
man – men
mouse – mice
goose – geese
Nouns ending in vowels like y or o do not have definite rules.

baby – babies
toy – toys
kidney – kidneys
potato – potatoes
memo – memos
stereo – stereos
A few nouns have the same singular and plural forms.

sheep – sheep
deer – deer
series – series
species – species