Ve významu "po dobu" používáme FOR
We have been living here for ten years.
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She has been learning English for three months.
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John has been sleeping for a very long time.
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They have been building their house for ages.
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They will attend this school for four years.
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Ve významu ”odkdy” používáme předložku SINCE
vyjadřuje časový bod nebo úsek jako začátek děje
I have been waiting for you since two o’clock.
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They have been working there since February.
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We have known each other since 1980.
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I haven't seen him since.
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They will be there from six.
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Procvičování