English Grammar : article, syntax, verbs conjugation, English spelling

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Nouns can typically be divided into two categories: COUNT and MASS nouns. Nouns that are countable (e.g. “one house,” “two houses;” or “one deer,” “two deer” are called “count nouns.” The plural forms of the these nouns are usually made by adding an “s” to the singular forms. For example:

Singular Plural
horse horses
train trains
boy boys
drink drinks
However, some countable nouns have irregular plural forms:

person people
sheep sheep
man men
fish fish
tooth teeth
MASS nouns are things which can't be counted by themselves because they are always treated as a group, volume, mass or quantity. Some common mass nouns are:

liquids: water, oil, gasoline
materials: coal, steel, wood
food: bread, fruit, butter
ideas: love, knowledge, advice
In order to count mass nouns you must use “amount words” or “quantifiers.” Some examples are: a pound of butter three baskets of fruit four slices of bread two liters of oil a glass of water a grain of sand two pairs of eyeglasses

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