Laugh and Smile
Incorrect: He was smiling very loudly.
Correct : He was laughing very loudly.
Incorrect : She laughed at me in a friendly fashion.
Correct : She smiled at me in a friendly fashion.
Note : When you smile, you make a facial expression of happiness. But when you laugh, you produce sounds with the voice at the time of smiling. You cannot laugh at anyone in a friendly fashion. To laugh at somebody is to treat them as foolish.
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