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--- I ______ so busily recently that I ______ no time to help you with your math. --- That’s OK....

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while    when    since    after  
while    when    since    after  
So he did; so did I    So did he; so I did   So he was; so was I    So was he; so I was  
while    when    since    after  
So she did; so did I    So did she; so I did   So she was; so I was    So was she; so I was  
busy, coming    busy, come    busily, coming    busily, come  
while    when    since    after  
So she did;so did I  So did she;so I did   So she was;so I was  So was she;so I was  
busily prepared     busy preparing     busyly prepare      are busily preparing  
had been working; had had    have been working; had    have been working; have    am working; will have  
busily prepared     busy preparing     busyly prepare    are busily preparing
  
was working; has left    had worked; left    was working; had left    had worked; had left  
have been working; have    have worked; had    am working; will have    had been working; had had  
while   when   since   after  
So he did, so did I    So did he, so I did    So he was, so was I    So was he, so I was  
so do I; So shall I    so I shall; So shall I    so I shall; So do I    so do I; So I do  
so I shall, So do I    so I shall, So shall I    so do I, So shall I    so do I, So I do  
have been working; have   have worked; had   am working; will have   had been working; had had  
So she did; so did I    So did she; so I did   So she was; so I was    So was she; so I was  
busy enough    enough busy    busily enough    enough busily  

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