I have something to eat 这里的不定式为什么要用to eat而不是to be eaten

I have something to eat 这里的不定式为什么要用to eat而不是to be eaten 动词不定式I give the dog a bone to eat.为什么是to eat 不是to be eaten 为什么这里要用不定式,这里的不定式做定语,I've got something to eat.（我有东西吃） I have sth. to eat.这里不定式用的是主动.The building to be built will Could i have something to eat? something to eat 为什么用to eat ,考什么知识点 i want something to eat I want to have something to eat.(说明原因) I want to have something to eat(说明原因) Do you have something to eat to eat是什么成分 Dad,i'm hungry. Can I have some cakes to eat?中,为什么用to eat I would like to have something ____(eat).用单词的适当形式填空