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THE DAY PREVIOUS TO TODAY
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WE USE IT TO EXPRESS THAT SOMETHING HAPPENED IN THE PREVIOUS 7 DAYS BEFORE TODAY
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IT MEANS THAT SOMETHING HAS HAPPENED EARLIER THAN WE EXPECTED
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We use it to indicate that something hasn't happened at any occasion
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IT IS USED TO EXPRESS WHEN SOMETHING STARTED
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We use it to indicate that something happens during this day
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WE USE THEM IN NEGATIVE AND INTERROGATIVE SENTENCES
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WE USE IT TO INDICATE THAT SOMETHING HAS JUST FINISHED
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IS USED TO COUNT BACK FROM THE PRESENT. iT IS USED WITH A PAST TENSE AND A TIME EXPRESSION. FOR EXAMPLE: TWO DAYS...
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WE USE IT TO FOCUS ON THE LENGTH OF TIME IN WHICH THE ACTION TOOK PLACE