articles | the words the (definite), a and an (indefinite)
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count nouns | nouns that can be quantified or enumerated
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modals | verbs that fuction as helpers within a sentence
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noncount nouns | nouns that cannot be quantified or enumerated. Such nouns--like mud and freedom--do not have plural forms.
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two-word verbs | a verb that consists of a verb followed by a preposition; also called phrasal verbs.
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