All the young people are greatly interested in pop music.

All the young people are greatly interested in pop music.
All the young people ( ) great ( ) in pop music.书上的答案是showed...interest,为什么加ed?

因为是 过去时
再问： 哪儿看出是过去时？
再答： 所有的年轻人都表现出对流行音乐很感兴趣 翻译一下 （它是哪种题型？）
再问： Rewite the sentence as required.上面一句是原句，下面一句是根据原句改写句子。