Deal in and Deal with
Incorrect : This book deals in common errors in English.
Correct : This book deals with common errors in English.
Incorrect : My brother deals with medicine.
Correct : My brother deals in medicine.
Note: "To deal with’ means to have to do with. It may also mean ‘to do business with’ or "to arrange a matter'. For example:
You should not deal with such a dishonest man.
The chairman will deal with this question.
But ‘to deal in' means “buy and sell'.
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