Sheep plural - sheep

Similarly you might study the native people s of X, i.

We know that hit in the above sentence is hit + past because of the time adverb yesterday, and we know that sheep is the phonetic form of sheep + plural because of the plural verb form are.

What is a group of ravens called? It is one of many irregular plural nouns, a noun that becomes plural in a way other than adding -s or -es to the end.

The reason is that in English, you can use nouns as adjectives, and adjectives never take a plural.