text: But there always a correct time to use this. If we can tell if someone is really depress that's when we do something because it's hard to control yourself when you are really sad. We shouldn't just wait and see what happens, we have to do something about it, because we are all human. If we see someone very depress we try to cheel them up, but what if we can't tell. That's also another example when we should use them. We can stop things from happening, bad things.