6. The most common rule for forming plural nouns is



A. adding -es to the word.
B. changing the y to i and adding -es.
C. dropping the last letter and adding -ies.
D. adding -s to the word.

I THINK B IS MOST COMMON

B works only with nouns that end in -y.

Please re-think ... no guessing!

OH THEN IT HAS TO BE D THE S MAKES IT PLURAL

The most common rule for forming plural nouns is to add -s to the word. This means that the correct answer is option D. To get to this answer, you can think about how most nouns become plural in English. Usually, you just need to add -s to the end of the word. For example, to make the singular word "book" into its plural form, you would add -s to get "books." This rule applies to the majority of nouns in English.