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—When was the old car invented?—I think the car about one hundred years ago.nvents

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himself   he himself   he for himself   he by himself
  
did:invent  was;invented  i  
when   so   as soon as   but  
when is the abacus invented    when the abacus is invented    when was the abacus invented    when the abacus was invented  
was to walk    had been walking    walked    was walking  
did, invent    was, invented    does, invent    were, invented  
was to walk    had been walking   walked    was walking  
when    which    whether    that  
broke up    broke down    broke in    broke off  
while    if    whether    when  
Although    When    Because    If  

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