In grammar, there are different types of word (such as ‘noun’, ‘adjective’ or ‘verb’) and phrase, which are called parts of speech or word classes. Nouns A noun is a word used for a thing or a person: book, tutor Many nouns can be singular or plural: source, sources Some nouns are called ‘uncountable’ because they cannot be used in a plural form: education, health Verbs A verb is a word used for an action or a state: write, think A verb tense is the form of a verb used for the present, the past or the future: wrote, will write, was thinking See 4 Correct tense formation. An auxiliary is a form of the verbs ‘to be’ or ‘to have’ that is used to create some verb tenses: has given, was thinking An auxiliary is also used for forming negative verbs: did not happen, are not working and questions: did it happen? have they seen it? A modal verb is a verb that goes with another verb to express various ideas or shades of meaning. Modal verbs are may, might, can, could, should, must, ought to, would, will, shall: should happen, would not have happened, might be changing See 6 Modal verbs. A participle is a form of a verb used in various verb tenses.
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