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They have beeen saving money for twelve years.
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Tom is very happy since dad retired.
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He has been sleeping since the beginning of class.
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Granny has been cooking for a long time.
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He has been waiting for ten minutes.
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They have been dating for two years.
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The Millers have been married for 50 years.
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The dog has not eaten since last week.
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My aunt has been ill since last Tuesday.
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He has been working for twelve hours.
We have been coming to this camp site ...............five years.
We have been coming to this camp site for five years.
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She hasn't stopped eating since she harrived home.
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She hasn't slept for a whole week.
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It has been raining since yesterday.
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They have been playing chess since 8:00 AM.
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They have been friends since elementary school.