Now you know that plural forms of nouns have -s, - es or -ies at the end. But the plurals of some nouns are formed differently. 

Singular :

1. woman 

2. person 

3. goose 

4. half 

5. wife 

6. potato 

7. cactus 

8. fungus 

9. oasis 

10. syllabus 

11. datum 

12. focus 

13. louse

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Plural:

1. women 

2. persons /people 

3. geese 

4. halves 

5. wives 

6. potatoes 

7. cacti 

8. fungi 

9. oases 

10. syllabi/syllabuses 

11. data 

12. foci 

13. lice

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