请问这句的句子成分是?越详细越好,

It seems to me that you did not do very well in the first two years.
看来你第一、二年的成绩不甚理想
这是一个固定句型,结构是：it seem (to sb) + that从句,意思是“（对某人来说）似乎/好像...”.
句子谓语：seems
状语：to me
that引导表语从句：that you did not do very well in the first two years.
主语：you
谓语：didn't do
状语：very well in the first two years.

这句的话，it 是句子的形式主语，that从句 是真正的主语。这种句式非常常见。

It主 seems系动词 to me状语
that you主 did not do谓 very wel状l in the first two years状.（表语从句）

本句句型分析有两个要点：
1、that引导的主语从句。“that you did not do very well in the first two years”是一个从句，并且在整体句子结构中充当主语。
2、It这个代词，指代后面的that引导的从句；it是形式主语，真正的主语后置，目的是为了避免“头重脚轻”，使表达更加舒适、合理。

所以，本句原本的表达是这样...