Page 27 - Red Feather Book 1

g Uncountable Noun: Names a mass, you are NOT able to form plurals with them. They are only used in singular.
Examples: music (you cannot say musics) furniture (you cannot say furnitures)
Other examples: art, money, water, homework
h Compound Noun: A noun formed by more than one word. There are three types of compound nouns:
1. Hyphenated: the words are separated by a hyphen. Example: sister-in-law
2. solid: the words have no space between them. Example: background
3. open: The words are written separately. Example: credit card
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The Red Feather Literature Second Course