1.Who knocked at the door so loudly?I don’t know.

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1.Who knocked at the door so loudly?I don’t know.
I don’ t know ____ _______ at the door so loudly.
2.Do you know ______ else is going to be on duty today?（who,whom）
3.I really don't know________ the bridge will be finished.（how long,how soon）

1 who knocked
2 who
　做从句的主语,所以用who
3 how soon
后面有will,表示将来时,用how soon,问多久
我不知道这桥多久就能修好

1.Who knocked at the door so loudly?I don’t know. —Who’s that talking loudly in the next room?—I don’t know.Ma 为什么I don't know if is polite to speak loudly at the table中if Someone knocked at your door just now,but I dindn't see who 1.I was out of town at the time,so I don`t know exactly how The door is open.Who has opened(open)it?Sorry,I don't know.为 A：who knocked at the door?B:I thought is was Jack.这里为什么用was, Who knocked at the door?I thought it was Jack.回 She went d_____to see who knocked at the door. 1.Someone knocked at the door.I went over to answer the door I don't know who the watch____ I knocked at the door (l ) of times ,but he didn't hear it.