One feels the need to go to toilet. He/she has to say it to them politely. What would be the polite and impolite expressions?
To seniors, to juniors, to friends. (Please give some examples that can be used as polite and impolite expressions)
As for the native speakers, this one is not a matter of importance or discussion, but it is really essential for non-native speakers. We can move away with any excuse, yet I want to learn the words from native speakers.