What are words that change form to become plural?
http://grammar.ccc.commnet.edu/grammar/plurals.htm
Just about all nouns and verbs have both singular and plural forms.
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http://grammar.ccc.commnet.edu/GRAMMAR/plurals.htm
There are several words in the English language that change form to become plural. In order to identify these words, you need to understand the rules of pluralization. Here are some common examples:
1. Regular nouns: Most nouns form their plurals by simply adding an "s" at the end. For example, "cat" becomes "cats" and "book" becomes "books."
2. Nouns ending in "s," "x," "z," "ch," or "sh": For nouns ending in these sounds, you typically add "es" to make them plural. For instance, "bus" becomes "buses," "box" becomes "boxes," and "church" becomes "churches."
3. Nouns ending in "y": If a noun ends in a consonant followed by "y," you usually change the "y" to "ies" to form the plural. For example, "baby" becomes "babies" and "city" becomes "cities."
4. Nouns ending in "f" or "fe": When a noun ends in "f" or "fe," you typically change the "f" or "fe" to "ves" to make the plural. For instance, "leaf" becomes "leaves" and "wife" becomes "wives."
5. Irregular nouns: Some nouns have unique rules for forming their plurals. For example, "child" becomes "children," "woman" becomes "women," and "man" becomes "men."
It's important to note that there may be exceptions or variations to these rules, so consulting an English grammar resource can provide you with comprehensive information on plural forms.