be busy to do有没有这种形式,be busy doing 有啥区别

be busy to do有没有这种形式,be busy doing 有啥区别 有没有be busy to do sth. 到底有没有be busy to do这个结构, 有没有be busy to do sth?busy也是形容词丫!为什么?不是be adj to do 有没有won‘t need to do这种形式! think sb to do/be有没有这种用法, 是否有be thankful to sb to do sth这种形式 be busy to do sth有这个短语吗 busy有没有复数形式 为什么是be busy doing而不是be busy to do be busy to do 还是 be busy doing different from...to...这种形式有没有? “be hesitate to doing”有没有这种用法?如果有,和be hesitate to do有什么区别? 在英语中有没有be terrified to do sth 这种用法 1.be busy(in )doing 2.be busy to do 3.be busy with 4.be busy for区别? be confident to do 有没有 see sb.do sth.的被动是be seen to do sth吗如题,还有有没有be seen do sth这种句式, 有want to be done 这种形式吗