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Listen! Someone     (knock) at the door.

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the telephone rang   Anna heard the telephone ring   someone knocked at the door   there was a knock at the door  
knocks    to knock    knocked    knocking  
Hear, crys    Listen, is crying    Hear, are crying    Listen, cries
  
knock  knocking  knocked  to knock  
have listened    listened    was listening    listen  
was knocking at    knocked    knocked at    knock at  
is; knocking    is; knock    are; knocking    are; knock    
knock  knocking  knocks  to knock  
had interrupted    would have interrupted    to have intrrupted    to intrrupt  
had I gone;someone knocked at    I had gone;did someone knock at    had I gone;did someone knock at    did I go;someone knocked at  

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