pumas are large,cat-like animals which are found in american.我想问的是which后面为什么加are 而不可

题目

pumas are large,cat-like animals which are found in american.我想问的是which后面为什么加are 而不可
pumas are large,cat-like animals which are found in american.
我想问的是which后面为什么加are 而不可以直接found
are和found 不都是动词吗?为什么可以这样说?

答案

因为是被动式,animals在美洲被发现,而不是animals在美洲发现了其他的什么东西.
建议您多看看被动式的基本用法,比如 animals are found in america, 动物在美洲被发现.