Where would I insert an exclamation mark and a comma in the below sentence?
"Look at that boy" he exclaimed.
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According to Oxford, you can add the exclamation mark if you want to express that the "speech" is shouted or spoken loudly. I believe that it can emerge a drammatic effect in your writing. But if you consider it as a plain command, just use a period.
Regarding the comma, it should be inserted in the closing quotation marks(I have no references for this, but I read lots of novels, and they do so).
But don't use two punctuations in a row.
"Look at the boy!," she exclaimed" is wrong.