A: The night that - that Rosemary was killed before we even knew that she was dead, everybody’s looking for her… except for Madeline.
A: She was, she was just acting so strange. You know, like she was, she was high or something.
Question: The sentence “she was just acting so strange”, so it is okay to use strange as an adjective instead of using strangely as an adverb, right?
Strange is clearly working as an adverb here. Strangely would be more correct, but maybe it would sound too formal.
Here’s a related thread in another forum: Act + adj or adv? [Acting crazy /crazily: strange /strangely] | WordReference Forums
This is correct - I act strange, weird, funny… all used colloquially.
Not just with the verb 'to act"… one can also walk funny, eat funny, talk funny…