18

Which is correct: interested on or interested in?

19

You can check questions like this using the Corpus of Contemporary American English. “Interested in” gets 23703 results and “interested on” gets only 13.

11

Interested in chess is correct. Nobody says interested on chess, for example.

7

"In", only. One can also be "interested to [verb]", e.g. "I'd be interested to see whether he shows up.".

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