**Here are some examples of using the word «knock» in English:**
1. I accidentally knocked over a vase when I was cleaning the room.
2. He knocked on the door several times, but nobody answered.
3. She knocked her knee against the table and felt a sharp pain.
4. The wind started to pick up and the rain began to knock against the windows.
5. The teacher knocked on the board to get the students' attention.
6. He knocked the ball against the wall and it bounced back.
7. She knocked on wood to avoid bad luck.
8. The delivery man knocked at the front door and handed me the package.
9. The police officer knocked on the suspect's door and asked him to open up.
10. The sound of rain knocking against the roof was soothing and calming.