The plural form of a noun in Engpsh is typically formed by adding "s" to the end of the singular noun. For example, the plural of "cat" is "cats" and the plural of "house" is "houses". There are some exceptions to this rule, however. For example, the plural of "mouse" is "mice" and the plural of "child" is "children". If you're unsure of the plural form of a particular noun, you can try looking it up in a dictionary.