If you want to have high level of creativity,it's a must that you have to be depressed
问题描述：
If you want to have high level of creativity,it's a must that you have to be depressed
请问句中的that可以省去吗,如果可以,那么请问什么时候不能省去that
答
这个句子不是同位语从句,而是主语从句
这个句子相当于：That you have to be depressed is a must.
it 这里是形式主语
假如是同位语从句的话,那意味着这个从句是对must的进一步解释,这里显然不是.
给个同位语从句的例句：
He heard the news that his team had won.他听到了他的队获胜的消息.
这里his team had won是对news的进一步说明.
搞明白了句子成分,就知道,这个that是不能省略的,因为它是引导主语从句的.
主语从句/表语从句/同位语从句的引导词如果是that,都不能省略,只有定语从句中,当that充当宾语的时候,一般可以省略