I've lived with her for six years.
I've been ill for last night.
I have known about that since yesterday.
My family has lived in this house for over a centur.
I've been in my job since September
Since - служит отправной точкой какого-то события, а for в течении какого времени это происходило.
Over six thousand kinds of plants are growing in Kazakhstan (from them 515 - only here), on its open spaces it is possible to meet about 500 kinds of birds, 178 kinds of animals, 49 kinds of reptiles, 12 kinds of amphibians, and in the rivers and lakes - 107 kinds of fishes.
A variety of invertebrate animals here is even more: not only there are more then thousand kinds of insects. Mollusks, worms, spiders, crustaceous and others living in Kazakhstan are not less than 30 thousand kinds.
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