2) - their   office   hours don't begin   at 9 o'clock
 ?  do   their   office hours begin   at 9 o'clock? 
 3) - mr. bell isn't busy all day.
 ?  is mr.bell busy all   day? 
 4) - there aren't sone cables on the table.
 ?  are some cables on the table? 
 5) - she can't translate some letters from english into russian.
 ?  can she translate some letters   from   english into russian? 
 6) - he doesn't has some offers   fron bell& co.
 ?  does he has some offers from bell& co.
 7) - mr. smith hadn't   bought several machines   from green& co by   june 2005.
 ?    had mr. smith bought   several   machines   from green& co   by june   2005? 
 8) - they weren't reading french newspapers yesterday at 5 o'clock.
 ?    were they   reading   french newspapers   yesterday at 5 o'clock? 
 9) - the engineers didn't meet some inspectors   a   week ago.
 ?  did the engineers   meet some inspectors   a week ago? 
 10) - we haven't already received fives enquiries   from blake& co.
 ?  have we already   recieved fives   enquiries   from blake& co? 
 11) - they haven't   a lot of   offices in london.
 ?  have they   a lot of   offices   in london? 
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