一.I forget the day that is Sunday.这个句子对吗?如果对,这个句子是定语从句还是表语从句

I forget the day that is Sunday。这个句子语法是没问题的,定语从句,that 引导定语从句,但是一般情况都是用which引导的。
I forget（that） the day is Sunday。也是对的,是省略了that 的宾语从句。
两个句子不是同意的。
forget是个及物动词,接宾语从句,不定式,或v-ing形式。没别的形式可做他的宾语了。
I realize the door of the school that is close when I arrive at shool。
是个病句,that位置调整一下,改成I realize that the door of the school is close when I arrive at shool。