1. Whole groups made up of similar items: baggage, clothing, equipment, food, fruit, furniture, garbage, hardware, jewelry, junk, luggage, mail, machinery, make-up, money/cash/change, postage, scenery, traffic.

2. Fluids: water, coffee, tea, milk, oil, soup, gasoline, blood, etc.
3. Solids: ice, bread, butter, cheese, meat, gold, iron, silver, glass, paper, wood, cotton, wool, etc.
4. Gases: stream, air, oxygen, nitrogen, smoke, smog, pollution, etc.
5. Particles: rice, chalk, corn, dirt, dust, flour, grass, hair, pepper, salt, sand, sugar, wheat, etc.

6. Abstractions:

ï beauty, confidence, courage, education, enjoyment, fun, happiness, health, help, honesty, hospitality, importance, intelligence, justice, knowledge, laugher, luck, music, patience, peace, pride, progress, recreation, significance, sleep, truth, violence, wealth, etc.

ï advice, information, news, evidence, proof;

ï time, space, energy;

ï homework, work;

ï grammar, slang, vocabulary.

7. Languages: Arabic, Chinese, English, Spanish, etc.
8. Fields of study: economics, chemistry, engineering, history, literature, mathematics, psychology, etc.
9. Recreation: baseball, soccer, tennis, chess, bridge, poker, etc.
10. General activities: driving, studying, swimming, travelling, walking (and other gerunds).

11. Natural Phenomena: weather, dew, fog, hail, heat, humidity, gravity, rain, lightning, sleet, snow, thunder, wind, darkness, light, sunshine, electricity, fire.