It's hard to understand why there is gravity这是强调句么

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It's hard to understand why there is gravity这是强调句么
It's hard to understand why there is gravity这是强调句么

It's hard to understand why there is gravity这是强调句么
这是to do 不定时作主语的句子
真正的句型是:To understand why there is gravity is hard.由于主语太长,有些头重脚轻.
所以,说英语的人们常这样说:
It's hard to understand why there is gravity.
不是强调句

这是非常典型的名词性宾语从句....
没有特别地强调什么,仅是一种句式,很难弄明白为什么会有地心引力

不是强调句
这是宾语前置句
It is Mary who took my book.
这是强调句