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c3a4z1.htf
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1997-01-20
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C3A4z1
About Tense
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Tense refers to the time element expressed by a verb. Verb
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tense shows whether an action has already occurred, is
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now occurring, or will occur in the future. Although there are
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four principal parts to verbs, these four parts are used to form
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six tenses: present tense, past tense, future tense, present
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perfect tense, past perfect tense, and future perfect tense.
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These tenses can be subdivided into progressive form (be +
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present participle). Present and past can be further
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subdivided into emphatic. Many of these tenses
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(progressive, perfect, future, etc.) are formed by verb
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phrases rather than individual verbs.
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Special Problems
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The main verb of an independent clause imposes time
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constraints on the verbs of dependent clauses in the same
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sentence. (See
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Sequence of Tenses
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80
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C3A4cz1.htf
.) Since the verbs of
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the main clauses below are in past tense, the verbs of the
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dependent clauses must also be in past tense:
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Incorrect:
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He found that he can skate.
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Correct:
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He found that he could skate.
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Incorrect:
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He knew that he will skate.
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Correct:
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He knew that he would skate.
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Do not use
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would have
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in
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if
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clauses to express the earlier of
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two past actions. Use the past perfect.
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Incorrect:
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If I would have known, I could have helped.
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Correct:
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If I had known, I could have helped.
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More choices
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Tense Choices
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