Someone is knocking at the door; I think/I dare say it’s Mother.

有人敲门，敢是妈妈吧？

There's knocking at the door.

有敲门的声音。

Who's it knocking at the door?

谁在敲门？

A:Who's it knocking at the door?

谁在敲门？

I heard him knocking at the door.

我听见他正在敲门。

Listen, someone is knocking at the door.

听着，有人在敲门。

Didn't you hear me knocking at the door?

你难道没有听见我敲门吗？

Listen! ! Someone is knocking at the door.

听！有人在敲门。 铛。

Who could be knocking at the door so late?

我奇怪都这么晚了，是谁在敲门？

Fowler jumped at the sudden knocking at the door .

福勒被突如其来的敲门声吓了一跳。