be+busy+doing=be+( )+(
问题描述：
be+busy+doing=be+( )+(
答
be busy doing sth =be busy with sth =doing sth busily =bi busily doing sth
呃,其实呢,就是一个busy的形容词和副词的变换,
busy后跟忙的事情时用with,其他的用法就是个正常形容词和副词的用法了……