| Singular | Plural |
| 1. add -s to moust nouns | |
| girl | girls |
| boy | boys |
| 2. add -es if end in -o | |
| hero | heroes |
| potato | potatoes |
| 3. add -es if ending in ch, sh, ss, x | |
| box | boxes |
| brush | brushes |
| 4. drop y and add
-ies if ending in y after consonant | |
| lady | ladies |
| city | cities |
| 5. drop the f(e) and
add ves if ending in f or fe | |
| wife | wives |
| kinfe | knives |
Change the form of several common nouns
| Singular | Plural |
| man | men |
| woman | women |
| child | children |
| person | people |
| foot | feet |
| tooth | teeth |
| mouse | mice |
Use the singular form for the plural of several nouns
| Singular | Plural |
| deer | deer |
| sheep | sheep |
| fish | fish |
| series | series |
| species | species |