be up to sth 忙于意思时

be up to sth 忙于意思时 be up to有忙于的意思么.如what I ’ve been up to be up to do be up to doing be up to sb to do sth it is up to you 他们之间有何区别?哪be up to doing be up to do 有忙于做某事的意思么 忙于做某事为什么要用be busy doing sth 可以用be busy to do sth吗为什么不能用to do啊 work on和be busy doing sth.的区别work on 是从事；忙于什么的意思,be busy doing sth.乜是 忙于某事嘚意思.有什么区别哪? be fed up with sth ,be fed up doing sth?意思有区别么? be able to do sth 意思 用法! to be honest with sth什么意思 sth need to be done的意思 be attached to sth啥意思 add sth up和add up to和add sth to sth的区别,用法,意思等? 英语翻译be away,be back,be out,be in,be over,be on,be up,be up to sth.;be capable of sth.,be proud of sth.be away,be back,be out,be in,be over,be on,be up,be up to sth.等短语及与其类似的短语怎样使用? 两个句型‘～1.be important to sb./sth.2.build sb./sth.up请问, be made up of sth have sth.to do和have sth.to be down和have sth.down是have sth.to do和have sth.to be down意思相同,还是have sth.to be down和have sth.down相同? be up to date的意思? to be made up of 的意思 be up to you to decide后还能再加to do sth吗