come about	happen. How do such inventions come about?
come up with	think of. Entrepreneurs often come up with ideas to make our lives a little more convenient.
come to	start to. Over time, we come to rely on them.
come across	find by chance A researcher came across the material for Post-it notes when looking for a new kind of glue.
come up to	approach. I really don't like it when strangers come up to me on the street and try to sell things.
come up against	face. Even though popcorn has come up against some opponents who say that it is unhealthy, it remains very popular and is even marketed today as a health food.

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