问一个 英语问题哈

当被修饰的词是place 时,后边的做定语动词不定式中to live 后的介词常省略.
have never seen one that was suitable foe animals to live in.
for animals to live in.这里是不定式做形容词suitable状语,其后的介词不省略

第二句是定语从句
live in the zoo
也可以写成.....one in which was suitable for animals to live
大概是这样子滴1

语感，英语很压韵。