Your understanding is correct. Where did you read the sentence? Sometimes a usage that is not correct grammatically is still used idiomatically.
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ReegisHe behaves strange.It's OK. "behave" can be considered a linking verb. "act" is more common in ordinary conversation. For example, He's been acting strange lately sounds better to my ear than He behaves strange. On the other hand, I wouldn't lead the charge against anyone who said "strangely" in those sentences. It's not a serious gra
CalifJim For example, He's been acting strange lately sounds better to my ear than He behaves strange.Hmmm, maybe an author purposefully used the present simple tense to indicate that being strange is somebody's personal trait. Thus, strange in He behaves strange might pe
ReegisHe behaves strange [in general]. = He is strange [in general].Yes. The present simple connotes generality here.
ReegisDid you mean that you also prefer He's been acting strange lately to He's been acting strangely lately?Are both grammatically correct?Yes and yes, in my opinion. I believe this is a case wher
ReegisAdjective: She looks confident in her new job.Adverb: She looks confidently at all the assembled partnersShe looks confident in her new job.
CalifJimYes and yes, in my opinion. I believe this is a case where opinion may enter into the calculations. Others may insist on one version or another.I see. If even you are not 100% certain, then I think it is best for me to just remember that both versions are OK, leave this topic, and concentrate on another subjects. Still there are many of them:)
Reegisauthor didn't treat behave as an action verb.I think that "behave" in "He behave strange" describes a state (his state that is strange) rather than action; you can replace it with the linking verb "is".