Use some in a positive context when you don’t want to specify the number or quantity. Use many with countable nouns, when you want to refer to a large but indefinite number. For example:
I bought some apples / I bought many apples.
She made some friends in NY / She made many friends in NY
Examples for some / many
The child put some sand into the bucket.
I can lend you some money if you need it.
There aren’t any pears left. Only two.
We had some cake with the tea.
Don’t eat so many sweets or you’ll get fat.
I had some beer last night at the bar.
I don’t have many friends.
He brought some food with him.
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