다음 의미가 다른 한 문장은?
1. they are the students who ms. brown is teaching.
2. they are the students ms. brown is teaching.
3. they are the studentsthat ms. brown is teaching.
4. they are the studentsand ms. brown is teaching them.
5. they are the students whom ms. brown is teaching.
목적격 관계 대명사인데 왜 4번은 안 되는지 관계 대명사가 접속사에 대명사 아닌가요?
정답이 4번이라는데 이해가 잘 안 되네요. 설명좀 해 주세요.