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Which (if any at all) of the following two understandings of お世話になりました is
correct?

  1. The implicit subject is あなた. The お〜になります pattern is a 敬語 construction. The full sentence in plain form is あなたが（私の）世話をした, literally meaning "you took care of me".
  2. The implicit subject is 私. There is nothing special about the なりました part. It just means "became". The full sentence would be 私が世話になりました, literally meaning "I became 世話".

And what about ご馳走になりました？
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2020-12-24T17:03:27.190
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2020-12-26T12:41:31.520
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question
keigo subjects
Who's the implicit subject in お世話になりました?
The correct answer is the second.

If you translate litteraly, it means "I became trouble (for you)

世話 does not mean help here, but rather has the nuance of care here

EDIT: I do not know if you checked: [The grammar of
世話になる](https://japanese.stackexchange.com/questions/25746/the-grammar-
of-%E4%B8%96%E8%A9%B1%E3%81%AB%E3%81%AA%E3%82%8B)

but it provides some more details
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2020-12-24T21:13:04.617
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answer