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This tense is a dynamic tense. It gives the changing situation in its
present state. To give the final results of an activity, rather than
measure its present progress, use the Simple Past Tense.
I read fifty pages yesterday. (The number can change no more.)
Jacob was a writer, he wrote eleven books. (Jacob is dead.)
3.7 Finished actions in unfinished periods of time
Use this tense to discuss actions that happen in unfinished periods of
time. This usage is similar to 3.6.
Have you seen Jack today? (Today is not over.)
It hasn’t rained this year. (The year still continues.)
Lisa has never visited China. (The unfinished period is Lisa’s life.)
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With finished periods of time use the Simple Past Tense.
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