有没有be busy to do sth?busy也是形容词丫!为什么?

有没有be busy to do sth. be busy to do sth有这个短语吗 忙于做某事为什么要用be busy doing sth 可以用be busy to do sth吗 有没有be busy with doing sth? 为什么是be busy doing而不是be busy to do be busy doing sth 和be busy to do sth 的区别 是be busy doing sth还是be busy to do sth? be busy with sth 与be busy to do sth的区别 be busy to do 英语翻译allow sb.to do sth.ask sb.to do sth.be busy doing sth.be be busy to do sth.和be busy doing的区别 busy doing sth还是 busy to do sth