As we were listening to zhe radio,someone knocked at the doo

As we were listening to zhe radio,someone knocked at the doo we___(listen) to the radio when someone knocked at the door Whole we _______ breakfast,our little boy knocked at the doo Ted and his sister were listening to the radio （at this time Ted and his sister were listening to the radio (at this time They were listening to the radio at this time yesterday."(一般 jusy as we were leaving ,the postman (knocked/was knocking) Hardly _____ to sleep when someone knocked at the door. I was listening to the music____there was a knock at the doo he was listening to the radio at nine last night What were you doing when someone knocked at the door?当有人在敲门时 what were you doing when someone knocked at the door?分析一下句型