Question: Which is correct: "Have you received the money I sent you" or "Have you received the money I sent to you"?
Short answer: grammatically, both "Have you received the money I sent you?" and "Have you received the money I sent to you?" are correct.
However, in everyday usage, "Have you received the money I sent you?" sounds best and is most commonly heard.
The phrase, "Have you received the money I sent to you?" could be used, e.g., for emphasis or contrast in some context, perhaps when another recipient did not receive the money sent to them. As in, “Your brother says he hasn’t received his allowance. Have you received the money I sent to you?”
Either way, the “to” is not required.
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