Final answer:
To make nouns ending in a vowel plural, typically add '-s'. For nouns ending in 'y' followed by a consonant, change 'y' to 'i' and add '-es'. Some nouns ending in 'o' also take '-es'.
Step-by-step explanation:
To make most nouns ending in a vowel plural, you should add -s to the end of the word. For example, banana becomes bananas, and radio becomes radios. This rule applies to nouns ending in vowels such as a, e, i, o, and u. However, there are some exceptions to this rule depending on specific circumstances or the spelling of the word.
For instance, when a noun ends in y preceded by a consonant, you change the y to i and add -es to form the plural, as in baby to babies. Similarly, some nouns ending in o need -es to become plural, like potato to potatoes. It's essential to remember these variations when working with plurals in English.