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When to use "some" and "any" in a sentence?
The words some and any are used when the speaker cannot specify or does not need/want to specify a number or an exact amount. Compare the following sentences:
'I saw seven deer when riding my bike in the forest yesterday.' (It is important that you know how many deer I saw.)
'I saw some deer when riding my bike in the forest yesterday.' (I don't know exactly how many deer I saw. Or: It is not important that you know exactly how many deer I saw.)
In general, some is used in positive sentences and any is used in negative sentences and questions.