Used to indicate that something is unexpected or contrary to what was expected; actually; contrariwise

Used to express a concession or transition, often followed by a clause starting with 但是 dàn​shì or 就是 jiù​shì; however; while it is true that...

Used when pressing or urging someone for an answer or action, often reflecting the speaker's impatience

Used to soften the tone of a disagreement or to make a statement sound less blunt or certain