답변을 얻은 뒤 반드시 감사의 덧글을 남기고, 좋은 답변은 채택해 주시는 센스...
질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 :
1,He had two sons who became doctors.
2.There is a woman in the park who wants to see me.
3. It was he who told it to me.
4.He is not the man that he was.
5.He did everything that was possible to help her.
6.At last he had done all that there was to be done.
7.He is the man whom I like best.
8.I met Mr.Jones, whom I had not seen for five years.
9.Here is an old house which he was born in.
10. My watch, which I have had for ten years , keeps good time.

이 10문장에서 관계대명사가 생략 불가능한 문장좀 가르쳐주세요.
왜 안되는지랑 되는거는 왜 되는지 설명좀 부탁드립니다..