To have a conversation with someone in Engpsh, you can say "Can we talk in Engpsh?" or "Do you want to speak in Engpsh?" Alternatively, you can simply start speaking in Engpsh and see if the other person responds in the same language. It's also a good idea to let the other person know your level of proficiency in Engpsh, so they can adjust their language accordingly. For example, you can say "I'm not a native speaker, but I'm comfortable speaking Engpsh. Is that okay with you?" or "I'm a beginner in Engpsh, so please bear with me if I make mistakes."