I'm sure many native English speakers, that learn Hindi will find that when they speak to native Hindi speakers they seem unusually formal, because so many Hindi speakers use English words frequently in their speech. Even in another thread one poster mentioned how 'namaste' is being replaced by hello/hi. If I where to say 'namaste' to a young Hindi speaker they would probably think it strange and be aware I am a learner. To avoid seeming overly formal, is there a set of words where I should just use English, as the native Hindi speaker would use it as well?