The box is too heavy to carry为什么不能改为The box is too heavy to be carried

Question

如题所述

Answer 1

too
to就是一个固定句型啊。它可以有被动的含义，但我觉得也可以有主动的含义咯。比如说The
small
boy
is
too
short
to
acheive
the
top
of
the
air-conditioner.

Answer 2

to
carry
是起表明程度的作用
too
to
本身就具有被动的含义...
too句子主干是The
box
is
heavy，类似The
soup
is
too
hot
to
drink