1、忙于
... take action采取行动, 行动起来 be busy with忙于 put in place实施；实现；做到; 把……放到合适的位置 ...
2、忙于干某事
... do one's best尽或人最年夜的竭力 be busy with忙于干某事 be busy doing sth忙于做某事 ...
3、忙于做某事
先帮忙写介词，最好在写些初中语法谢谢，如：like to do +sth=like dong sth ,be busy with sth（忙于做某事），how much?问不可数-价钱…
4、忙着
... before all 尤其、出格 be busy with 忙着…… as a result of 因为…… ...
be very busy with sth忙于
be busy with homework会忙着做作业;功课忙;忙着功课
be busy with writing忙于写作
be busy with sty忙于
to be busy with忙着
be busy with research忙于研究工作
be busy with sth于某事;忙于某事;忙于;忙于做某事
be busy with detail忙于对付
be busy with research work专心于研究工作