uppföra sig betyder på engelska

act [acted, acting, acts]▼(to behave in a certain way)
verb
[UK: ækt] [US: ˈækt]

behave [behaved, behaving, behaves]▼(to act in a specific manner)
verb
[UK: bɪ.ˈheɪv] [US: bə.ˈheɪv]

conduct [conducted, conducting, conducts]▼(reflexively: behave)
verb
[UK: kən.ˈdʌkt] [US: kən.ˈdəkt]