not only A but (also) = B as well as A
1. A와 B 둘다 의미지만 B를 강조
2. 구문이 주어로 쓰일 때는 수를 B에 맞춘다.
3. A와 B는 비교하는 관계가 대등해야 한다.(병렬구조 원칙)
4. also는 생략될 수 있음
e.g The house is not only clean but also chiep. (chieply. X)
She enjoys not only reading books but also listening to music. (to listen.X)
Not only I but also she is very happy.
Not only the teacher but (also) the students are watching the movie.
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