student asking question

It looks unnatural without using "by" next to the made. How come does this sentence make sense?

teacher

Native speaker’s answer

Rebecca

You do not use "by" after made because the subject making the memories is implied (Adele's memories). If the memories were made by someone who was not mentioned, then you would add by after the word "made." The word "by" shows who or what is performing the action.

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