궁금한것이 있어 요렇게 글 남깁니다:) 선생님들의 답변 기다릴께요~

she said, i learned how to eat with chopsticks when i was in china.
을 간접화법으로 고칠 때
she said that she had learned how to eat with chopsticks when i was in china.
로 바꿀수 있습니다.
여기서 궁금한건,
learned 는 과거 완료가 됐는데,
was 는 왜 그대로 일까요?