Question

it is said that 和it is to say that的区别

Answer 1

it
is
said
that
这是个特殊的固定词组
意思为：
据说，听说

it
is
to
say
that这些单词是普通句子的句首部分，后面的that可以引出
say
的宾语。由
to
say
that.......
构成整个句子的表语。