Typically, when Socrates asks ‘What is . . .?’ (e.g. ‘what is piety?’), he is asking for conditions that are necessary and jointly sufficient for something’s being the thing in question (e.g. piety). First explain, in one sentence each, what (in principle) necessary conditions and what (in principle) sufficient conditions are. Then complete the following sentences (using the words ‘necessary’ and ‘sufficient’ to fill in the blanks): ‘Being red is a ____ condition for being coloured. Being coloured is a ____ condition for being red.’【多选题】