be+busy+doing=be+( )+(

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be+busy+doing=be+( )+(
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be+busy+doing=be+( )+(
be+busy+doing=be+( )+(

be+busy+doing=be+( )+(
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……

be busy with

be busy doing =be busy with sth

be+busy+doing=be+doing+busy