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Three other specific classifications for nouns are collective nouns, count nouns, and mass nouns. Collective nouns name groups, such as team, class, and choir. Count nouns can be counted. You can use a, an, many, or a number before count nouns. Examples include: one boy, six sheep, and many days. Mass nouns are not countable and include words like gasoline, water, and dirt.http://www.dailygrammar.com/Quiz-16-20-Nouns.htm
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Prepositions
A preposition is a word that begins a prepositional phrase and shows the relationship between its object and another word in the sentence. A preposition must always have an object. A prepositional phrase starts with a preposition, ends with an object, and may have modifiers between the proposition and object of the preposition.
Here is a list of common words that can be used as prepositions: about, above, across, after, against, along, among, around, at, before, behind, below, beneath, beside, besides, between, beyond, but (when it means except), by, concerning, down, during, except, for, from, in, inside, into, like, near, of, off, on, out, outside, over, past, since, through, to, toward, under, until, up, upon, with, within, and without.
These words can be used as other parts of speech. What part of speech it is depends on how it is used in that sentence. Many of the common words used as prepositions can be used as adverbs. Words are prepositions if they have an object to complete them. To decide which it is say the preposition followed by whom or what. If a noun or a pronoun answers the question, the word is a preposition.
Example: The boy stood up and ran down the street. Up what? There is no object; therefore up is not a preposition. Down what? Street answers the question; therefore, down is a preposition. Down the street is the prepositional phrase starting with the preposition down and ending with the object street with a modifier the in between.
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