Someone knocked at the door when I was sleeping.

当我正在睡觉时，有人敲门。

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At last Mrs. Medlock knocked at a door, and when someone said, "Come in," they entered the room together.

最后，梅德洛克太太敲了敲门，当有人说“请进”时，他们一起进了屋。

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Just last year, I was conducting a workshop when someone knocked at the classroom door.

就在去年，我正在教室里上研讨课的时候，突然有人敲门。

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