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1·Somebody was knocking on the window.

有人在敲窗户。《牛津词典》

2·All at once there was someone knocking on the door.

突然有人敲门。《柯林斯英汉双解大词典》

3·Someone's knocking on the door.

有人在敲门。

4·Somebody is knocking on the window.

有人在敲窗子。《新英汉大辞典》

5·HISTORY is knocking on the door.

历史正在敲门。

6·While knocking on every house he passed by.

路过的每家他都会敲门。

7·She said, Stop knocking on closed doors.

她对我说，“门已紧锁，敲有何用？”

8·Please do not enter before knocking on the door.

进来前请先敲门。

9·But we're not knocking on anyone's door to sell them anything.

但我们不会敲任何人的门出售任何东西。

10·We drove from house to house, knocking on doors, ready to begin our mission.

我们驱车挨门逐户拜访，一家一家地敲门，准备开始我们的任务。