Hello! What means "do" in Beatles' song "love me do"? What difference with just "love me"?
If I have any mistakes in my question, please correct me. Thanks!

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Well there isn´t much difference, but "love me do" basically means "Please love me".  

In english "do" isn´t used like this much anymore these days but you´ll mostly hear it as an answer form though for example "Do you mind if I hang my coat here?"  "No, please do" (in other words: please do it, please go ahead, feel free etc)

I hope I got this right!?!

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It's not proper grammar.  I'm assuming it's that way for artistic reasons.

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Oh~!
    sorry~! I don't know.
I want to mean.

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