1.Whom did you laugh at?
2.At whom did you laugh?
In first, "at" stands end of the sentence and in second,"at" with prepostion.
Are these sentences same?
The sentences have the same meaning. Sentence 2 is very formal. People usually say: Who did you laugh at?
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The sentences have the same meaning. Sentence 2 is very formal. People usually say: Who did you laugh at?
CB