以下的英语句子成分语法正确?

I think that it is impossible for us to finish our work正确
这是复合句 that引导的是宾语从句
I think it impossible for us to finish our work正确
这是简单句 it是形式宾语impossible是宾补 后面是动词不定式的复合结构 作真宾语
I think it impossible that we can finnish our work正确
这是复合句 it是形式宾语 impossible是宾补 后面是宾语从句 作真宾语
what made me happy was that he won the game这个句子是复合句 主系表结构
what makes me happy 是主语从句作主语is是系动词 that he won the game是表语从句作表语
它与that he won the game made me happy一样意思
这是 主谓宾结构 复合句
that he won the game 是主语从句作主语made是谓语 me是宾语 happy是宾补