have you heard someone knock at the door?为什么是knock,不是knoking

have you heard someone knock at the door?为什么是knock,不是knoking Did you hear someone knock at the door Listen:Someone ______(knock) at the door. knock at the door I heard someone _____(knock /knocking) at the door just now She was cocking when she heard someone ( )knock at the door WHEN I WAS READING I HEARD SOMEONE -----(KNOCK)AT THE DOOR 英语分析,he heard a knock at the door .he 是主语,heard 是谓语,a knock No sooner_____asleep than she heard a knock at the door Did you hear someone[ ] 【knock】 at the door when you[ ]【 wat Do you hear someone knock at the door? 怎么理解?怎么全是现在时?错了吗? knock at the door造句