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The teacher got really angry with the children. She kept asking them to do their work quietly, but they wouldn't stop messing about.

 

밑줄 친부분에서 didn't를 써도 될 것 같은데, 왜 굳이 wouldn't를 쓴 건가요?

would를 사용하면 어떤 뉘앙스의 차이가 있는 건가요?