Question

帮我分析下这句的语法和句式结构，看看有没有错误，谢谢。

The most striking feature that impresses me deeply is that unbelievably。 后面那个 is that unbelievably 能这么用吗？

Answer 1

不能这么用的。若果is后面that是引导词，引导表语从句的话，既然是从句，就应该是个句子，而不能是单个的词或词组。如果that是副词的话，that后面的就不能再接单个的副词了，必须是形容词或形容词作表语。改正后的句子任选下面一个。
1，The most striking feature that impresses me deeply is that （ ） 括号里为feature的具体内容。
2，The most striking feature that impresses me deeply is that unbelievabe. 此时的that相当于so表示程度“如此”。