Brush your _ (tooth) twice daily?

Irregular plural nouns are nouns that do not become plural by adding -s or -es.

Some irregular nouns have the same spelling in the singular form and the plural form.

Can you summarize what you’ve understood in the above steps?

Choice A is incorrect because "tooths" is not the right way to say more than one tooth. The correct word is "teeth." "Teeth" is an irregular plural noun because it doesn’t follow the usual rule of adding "s" to make things plural.

tooths

Choice B is incorrect because the plural form of "tooth" is "teeth," and it’s already irregular. We don’t add an "s" to make it plural like we do with most nouns.

teeths

Choice C is correct. Teeth is an irregular plural noun because "teeth" doesn’t follow the usual rule of adding "s" to make a plural. It changes completely to show more than one tooth, which is how irregular plurals work.

teeth

Choice D is incorrect because "tooth" is a singular noun, not a plural noun. An irregular plural noun for "tooth" would be "teeth."

tooth

Word given in the parentheses - Tooth

Irregular plural form for the word given in parentheses - Teeth

Complete sentence - Brush your teeth twice daily.

Choice C

Can you summarize what you’ve understood in the above steps?