knock
- knock the door (common error).
- knock on / at the door (OK).
Examples :
- I knocked and knocked but nobody answered.
- I knocked on the door but nobody there.
- Laila went up and knocked on the door.
- knock the door (common error).
- knock on / at the door (OK).
Examples :
- I knocked and knocked but nobody answered.
- I knocked on the door but nobody there.
- Laila went up and knocked on the door.
