Her mother is busy cooking in the kitchen. be busy doing sth.忙着做某事(她的母亲正在厨房忙着做饭。 )Be punctual in doing STH.在做……方面非常准时。Be busy doing sth.的意思都是“忙于做某事”。Be worth doing STH.值得做某事。But be this desire, also...
e up to sth.胜任某事 be busying doing 忙于做某事(正在进行 如: What are you up to?你在忙什么? What are these naughty boys up to?这些淘气的孩子们在干什么? It's up to me to get the four of us moving.由我来负责我们四个人的行动 ②be busy后面跟doing...