下面这句话的英语语法分析

Question

It is curious that he feels almost as though he has to justify his efforts to give his students a better future. 这句话的语法分析 运用的各种从句等

Answer 1

用了2个从句，一个是表语从句，一个是宾语从句


整个句子主语是it，谓语是is，表语是curious，that及后面所有的单词是由that引导的表语从句，是这句子真正的主语，但因为太长+英语里为了避免头重脚轻，用it来代替它放在句首做主语，真正的主语就置后了，做从句成分。

that引导的表语从句中又包含一个由as though引导的宾语从句，做feel的宾语

整个句子意思是：为了给他的学生一个更好的前程，他感觉他好像应该为他的行为自圆其说/合理化，这很奇怪。

Answer 2

这个it是本句的形式主语，is 系动词谓语，curious 形容词作表语。that ... 到句末是主语从句，是本句的真正主语，由于太长，让it代替它作形式主语。
主语从句中：
he 主语， feels 系动词谓语，as though ⋯future. 表语从句。追答

表语从句中：
he 主语
has to justify 谓语
his efforts 宾语
to give his students a better future 状语

整句汉义：令人奇怪的是他几乎觉得好像他得解释一下他为给他学生一个更好地未来而付出努力的原因。

Answer 3

为您解答
形式主语句
It形式主语 is系动词 curious表语(that he feels almost as though he has to justify his efforts to give his students a better future. ）真正主语

真正主语中
as though 引导方式状语从句， as though意为“好像，正如”，efforts后面非谓语动词to do不定式形式表示justify的目的，属于目的状语。