[求助]句子翻译及成分

Delta中阅读的1.1.B

question 1-3 中第一段的最后一句，句子成分如何划分？

He emphasized that only when the positive qualities outweigh the dangers does healthy psyshosocial development take plack.

does在这里指代什么？

He emphasized that only when the positive qualities outweigh the dangers does healthy psyshosocial development take plack.

"only when the positive qualities outweigh the dangers does healthy psyshosocial development take place.

宾语从句因为是用only开头,所以倒装,补出了does, 主语为healthy psyshosocial development.

when the positive qualities outweight the dangers, healthy psyshosocial development only takes place.

非常感谢

倒装句总是反应不过来。