it is beautiful.是什么句型

主系表结构
主she 系is 表 beautiful ：
结构 beautiful是形容词啊 is very beautiful 是谓语.
It is
句型
1.It is +
被强调部分
+ that ...
该句型是强调句型.将被强调的部分放在前面,其它部分置于
that
之后.被强调部分可
以是主语,宾语,表语或状语.强调的主语如果是人,
that
可以由
who
换用.如果把这种句
型结构划掉后,应该是一个完整无缺的句子.这也是判断强调句型与其它从句的方法.
It was about 600 years ago that the first clock with a face and an hour hand was made.
It was they that (who ) cleaned the classroom yesterday.
It was in the street that I met her father.