it is too hard to understand the voices

问题描述:

it is too hard to understand the voices
哪位英语大师来分析一下这个句子的句型结构特点等……
速度!

句型It is too……to do sth.it是形式主语,真正的主语是不定式to understand the voices.如果去掉it而把真正的主语放到前边,会造成头重脚轻的感觉.为避免这种情况就用it代之.