It is easier to say than do do前面要加to吗,why?...

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It is easier to say than do do前面要加to吗,why?...
It is easier to say than do do前面要加to吗,why?
...

It is easier to say than do do前面要加to吗,why?...
do前面必须要加to,因为进行比较的两部分在语法上要对称.
It is easier to say than to do .

to do 不定式做形式主语

需要加to ,to say ,to do,对称原则。

than两边的结构要对称,前面用to后面也要用to