the first movie that i saw is harry potter这个句子中关系代词可否用which

用that 在句中做什么成分 这是个包含了关系副词引导的定语从句的复合句I still remember the day when I first came to the school. (2) The

不能
先分析句子结构：主语：the first movie； 谓语：is ；宾语：harry potter
that I saw 是定语从句
定语从句中,先行词被序数词修饰,关系代词只能用that,不能用which.
1) 只能用that作为定语从句的关系代词的情况
a) 在there be 句型中,只用that,不用which.
b) 在不定代词,如：anything,nothing,the one,all,much,few,any,little等作先行词时,只用that,不用which.
c) 先行词有the only,the very修饰时,只用that.
d) 先行词为序数词、数词、形容词*时,只用that..
e) 先行词既有人,又有物时.