Regular Nouns - Plural Forms 📝

Here are the plural forms of the regular nouns:
- story → stories
- play → plays
- glass → glasses
- flag → flags
- photo → photos
- name → names
- match → matches
- knife → knives
- bush → bushes
- chief → chiefs
- page → pages
- radio → radios
- prize → prizes
- set → sets
- key → keys
- factory → factories
- wolf → wolves
- piano → pianos
- class → classes
- cup → cups
- city → cities

Rules applied:
1. Most nouns: add -s
2. Nouns ending in -ch, -sh, -s, -x: add -es
3. Nouns ending in consonant + y: change y to i and add -es
4. Nouns ending in -f/-fe: change to -ves

Irregular Nouns - Plural Forms 🔄

These nouns have special plural forms:
- child → children
- goose → geese
- man → men
- foot → feet
- mouse → mice
- woman → women
- sheep → sheep (unchanged)
- person → people
- deer → deer (unchanged)
- tooth → teeth
- ox → oxen

Note: These nouns don't follow regular plural formation rules and must be memorized.

Greek/Latin Origin Nouns - Plural Forms 📚

• criterion → criteria
• datum → data
• formula → formulae/formulas
• crisis → crises
• stimulus → stimuli
• index → indices/indexes
• phenomenon → phenomena
• medium → media
• oasis → oases
• nucleus → nuclei
• memorandum → memoranda
• basis → bases
• radius → radii
• analysis → analyses
• symposium → symposia
• hypothesis → hypotheses

Note: Some of these words may have alternative plural forms in modern usage.

Compound Nouns - Plural Forms 🔤

• fellow-worker → fellow-workers
• merry-go-round → merry-go-rounds
• man-of-war → men-of-war
• passer-by → passers-by
• sister-in-law → sisters-in-law
• forget-me-not → forget-me-nots
• room-mate → room-mates
• lily-of-the-valley → lilies-of-the-valley
• ticket-holder → ticket-holders
• commander-in-chief → commanders-in-chief
• governor-general → governors-general

Rules:
1. If the main noun is at the end: add -s to the end
2. If the main noun is at the beginning: pluralize the main noun
3. For hyphenated compounds: identify the main noun and pluralize it

Countable vs Uncountable Nouns 📊

Countable Nouns:
- computer
- leaf
- window
- mountain
- beach
- pigeon
- accident
- holiday
- scene
- job

Uncountable Nouns:
1. furniture
2. coffee
3. food
4. blood
5. work
6. language
7. advice
8. information
9. money
10. progress
11. permit
12. permission
13. baggage
14. luggage
15. traffic
16. weather
17. knowledge
18. air
19. water
20. damage
21. accommodation
22. scenery
23. bread
24. news
25. flour

Note: Countable nouns can be counted and have plural forms, while uncountable nouns cannot be counted and don't have plural forms.