that is what friends are for请分析下语法,

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that is what friends are for请分析下语法,
that is what friends are for
请分析下语法,

that is what friends are for请分析下语法,
这就是朋友所代表的意义.
That is引导的是主语从句,that是逻辑主语,普通语序是What friends are for is that.也就是说“what friends are for”是真正的主语.但太长了.所以英语习惯上用That引导的主语从句表达

朋友的价值就在于此。

这就是朋友的作用/用途。
for和be连用通常是表示目的或用途的。that为主语,is为系动词, what friends are for为表语从句。整个句子应该算主系表结构。