다음 문장 중 어법상 틀린 것을 고르시오
1. i was made to washed the car by him
2. the man was seen to enter the house by us.
3. the doorbell was heard to ring
4. he was made to stop smoking
5. he was seen to swim in the river.

답은 1번이래요
왜 틀렷는지 모르겠어요
그리고 나머지는 왜 저렇게 되는지도 모르겟어요 ㅠㅠ
알려주세요 ㅠㅠ