be busy doing的doing是做什么成分,是动名词还是现在分词一楼,成分呢?二楼,也没成分啊

be busy doing 和 be busy in doing 的区别? be busy doing sth 与be busily doing的区别 be busy doing造句 类似be busy doing ,enjoy doing 的初中英语语法 BE BUSY IN DOING 的例句 be+busy+doing=be+( )+( busy的用法be busy with后面加什么词be busy in doing与be busy with doing与be busy doing有什么区别 be busy with doing 与be busy doing 区别 be busy doing等于什么 be busy doing sth 例句 be busy in doing sth be busy doing 过去式+造句 be busy in 的用法?它和be busy doing, be busy with有什么区别? 各位帮我整理一些doing sth 的句型比如：be busy doing sth也可以是其他的，比如spend doing sth 请用be busy doing sth 的句式造句 关于一个疑惑的英语短语的区别be busy with doing sth和be busy doing sth区别? he is always busy___ (work)是用be busy doing sth还是 be busy with sth 是be busy doing sth还是be busy to do sth?