Irregular Plural Nouns worksheet for students to practice converting singular nouns to their plural forms.

The task is to write the plural form of each singular noun listed. Below are the solutions with explanations for each:

1. ox

- Plural: oxen
- Explanation: "Ox" follows an irregular plural rule where the ending changes from "-x" to "-en."

2. dwarf

- Plural: dwarves
- Explanation: "Dwarf" follows an irregular plural rule where the ending changes from "-f" to "-ves."

3. fungus

- Plural: fungi
- Explanation: "Fungus" is a Latin-based word, and its plural form is "fungi," which follows Latin rules.

4. focus

- Plural: foci
- Explanation: "Focus" is another Latin-based word, and its plural form is "foci," following Latin rules.

5. quiz

- Plural: quizzes
- Explanation: "Quiz" follows the regular plural rule by adding "-es" because it ends in "-z."

6. thief

- Plural: thieves
- Explanation: "Thief" follows an irregular plural rule where the ending changes from "-f" to "-ves."

7. wife

- Plural: wives
- Explanation: "Wife" follows an irregular plural rule where the ending changes from "-fe" to "-ves."

8. tuna

- Plural: tuna
- Explanation: "Tuna" is one of those nouns that remains the same in both singular and plural forms.

9. trout

- Plural: trout
- Explanation: "Trout" is another noun that remains the same in both singular and plural forms.

10. moose

- Plural: moose
- Explanation: "Moose" is also a noun that remains the same in both singular and plural forms.

11. wharf

- Plural: wharfs or wharves
- Explanation: "Wharf" can have two plural forms: "wharfs" (regular) or "wharves" (irregular).

12. thesis

- Plural: theses
- Explanation: "Thesis" is a Greek-based word, and its plural form is "theses," following Greek rules.

13. man

- Plural: men
- Explanation: "Man" follows an irregular plural rule where the ending changes from "-an" to "-en."

14. goose

- Plural: geese
- Explanation: "Goose" follows an irregular plural rule where the ending changes from "-oo" to "-ee."

15. salmon

- Plural: salmon
- Explanation: "Salmon" is a noun that remains the same in both singular and plural forms.

16. shrimp

- Plural: shrimp
- Explanation: "Shrimp" is a noun that remains the same in both singular and plural forms.

17. self

- Plural: selves
- Explanation: "Self" follows an irregular plural rule where the ending changes from "-lf" to "-lves."

18. larva

- Plural: larvae
- Explanation: "Larva" is a Latin-based word, and its plural form is "larvae," following Latin rules.

---

Final Answer:

1. ox → oxen
2. dwarf → dwarves
3. fungus → fungi
4. focus → foci
5. quiz → quizzes
6. thief → thieves
7. wife → wives
8. tuna → tuna
9. trout → trout
10. moose → moose
11. wharf → wharfs or wharves
12. thesis → theses
13. man → men
14. goose → geese
15. salmon → salmon
16. shrimp → shrimp
17. self → selves
18. larva → larvae

$$
\boxed{
\text{oxen, dwarves, fungi, foci, quizzes, thieves, wives, tuna, trout, moose, wharfs/wharves, theses, men, geese, salmon, shrimp, selves, larvae}
}
$$