Hello, could someone please check this sentence:

You are the one who is always talking about how proper scientific procedure must be adhered to.

Is it correct to use "proper" here? should it be replaced by "properly" ?

It is right to use "proper", then how to understand this sentence? I mean, the grammar, not the meaning

Thank you in advance.
'Proper' is proper, not 'properly'. Here, an adjective is needed, modifying 'procedure'.
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I do things proper or I do things properly.


I do things properly.


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Which of the 2 sentences is correct?

My mother taught me how to speak proper.

My mother taught me how to speak properly.

properly - it's an adverb that modifies the verb speak.