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What is the difference between these two sentences? Or are they the same?

How come I know what you study?

How can I know what you study?

closed as off-topic by michael_timofeev, user140086, Brian Hooper, anongoodnurse, Nathaniel Jan 1 '16 at 20:29

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    How come means why, why is it, for what reason or purpose. You don't use do in the two sentences. – user140086 Dec 30 '15 at 15:20
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First, the sentences are grammatically incorrect, since you must not use the do verb in both sentences, as @Rathony just said. The reason is that the second part of the sentence is a statement, that doesn't need do.

Your sentences would be then:

  1. How come I know what you study?

  2. How can I know what you study?

Now, back to your question.

How come is another way to say For what reason why or Why is it. Considering that, your first sentence would mean:

What is the reason why I know what you study?

You're asking the reason you know what the other person is studying.

About the second one, you're basically asking the other person:

What is the method/way to know what you study?

Here you are asking how you're able to know what the other person is studying.

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How come I know what you study?

This implies you know what they study, but are unclear why you know it.

How can I know what you study?

This implies you do not know what they study, and are unclear as to how you can learn it.

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