It is much better to be without shoes than without feet.为什么要

英语中许多介词给我们动词的感觉,但是不能当动词用.想用的话,通常要加别的动词,我们用的比较多并且常常翻译不出来意思的动词是be.如：
Mr Smith is at home. Smith先生在家.is就不能丢掉.
I like to be with you.我喜欢跟你们在一起. be不能丢掉.
He is against the plan.他反对这个计划. is不能丢掉.
咱们把你给的句子补全：
It is much better to be without shoes than (to be) without feet.
可以看出实际上是 to be without shoes is much better than to be without feet.
不定式作主语当然要加个be了.