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b3e2.htf
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1997-03-31
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B3E2
About Tense
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Verb tense expresses the time of action-present, past, or
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future.
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There are six tenses based on the three time categories.
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[Note that each tense includes a progressive form (listed
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second), using be + present participle, and both present and
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past include an emphatic form, using do or did.]
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Present Present Perfect
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I walk I have walked
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I am walking I have been walking
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I do walk (emphatic)
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Past Past Perfect
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I walked I had walked
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I was walking I had been walking
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I did walk (emphatic)
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Future Future Perfect
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I will walk I will have walked
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I will be walking I will have been walking
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The four principal verb parts (infinitive, past, present
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participle, past participle) are used to form all six tenses.
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Many of the tenses (progressive, perfect, future, etc.) are
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formed by verb phrases rather than by individual verbs.
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Special Problems
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The tense of the main verb affects the tenses of other verbs
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in the sentence. For example, if the main verb is in past
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tense, other verbs cannot be in the present.
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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 information
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Sequence of Tenses
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B3E2a.htf
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Related Topics
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Verb Parts
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B3E3.htf
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More choices
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Verb Tense Choices
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B3Ex.dib
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