您好 请问that's all I have seen and heard.这句怎么看出是名词性从句的?

您好 请问that's all I have seen and heard.这句怎么看出是名词性从句的?
您好 请问that's all I have seen and heard.这句怎么看出是名词性从句的?

您好 请问that's all I have seen and heard.这句怎么看出是名词性从句的?
名词性从句包括主,宾,表,同位语从句.
这句话中含有一个定语从句,修饰先行词all,即
That's all that i have seen and heard.关系词that省略了.
如果是that's what i have seen and heard.则此复合句中含有一个what引导的表语从句.

这是一个表语从句，all作代词，相当于everything, 这句可以改为that's everything that i have seen and heard, 后面包含一个定语从句，省略that.