这不算一个完整的句子,只能算是个状语.整体是以个一以when引导的状语从句,中间if是see的宾语从句.也就是when john walked around the museum to see if everything was all right是一个状语从句to see if everything was all right是john walked around the museum的目的状语if everything was all right是see的宾语从句?to see if everything was all right整体是john walked around the museum的目的状语，，这是不定式作母的状语，而if everything was all right是see所发出的吧，所以他就是see的宾语从句。所以还是说to see if everything was all right是john walked around the museum的目的状语if everything was all right是see的宾语从句?是的，有什么疑问吗？