to grasp (often fig.); to master; to know well; to understand sth well and know how to use it; fluency; to control; to seize (initiative, opportunity, destiny)[cedict]
to do; to make; to produce; to write; to compose; to act as; to engage in; to hold (a party); to be; to become; to function (in some capacity); to serve as; to be used for; to form (a bond or relationship); to pretend; to feign; to act a part; to put on a[cedict]