1. Mark the words which are countable (C) and which are uncountable (U): 1. glue; 2. air; 3. chalk; 4. dictionary; 5. ruler; 6. paint; 7. school; 8. money; 9. weather; 10. sand; 11. daybook; 12. uniform; 13. paper; 14. work.

Countable nouns name things that can be counted; uncountable nouns name substances or abstract concepts.

1. glue — U; 2. air — U; 3. chalk — U; 4. dictionary — C; 5. ruler — C; 6. paint — U; 7. school — C; 8. money — U; 9. weather — U; 10. sand — U; 11. daybook — C; 12. uniform — C; 13. paper — U; 14. work — U.