求助，英语大神，分析一下复合长句

Question

The first thing i believe we absolutely must do is to reduce the amount we use our cars

The first thing 主语
i believe 省略that的定语从句

那么 we absolutely must do 是什么成分？
is to reduce the amount we use our cars 又做什么成分？

Answer 1

句子翻译：我确信我们必须做的首要的事情就是减少我们的用车量。
这个句子主句是一个主系表结构的句子。
The first thing i believe we absolutely must do是主语
is是系动词
to reduce the amount we use our cars是表语
其中，主语是个定语从句，The first thing是先行词，I believe we absolutely must do是定语从句，省略关系词that。
I believe we absolutely must do是个宾语从句，I主语，believe谓语动词，we absolutely must do是个宾语从句。追问

那定语从句中 怎么会有believe和 must do 两个 谓语呢？

追答

I believe we absolutely must do是个宾语从句，I主语，believe谓语动词，we absolutely must do是个宾语从句。

也就是说，这句话是主系表结构，主语是个定语从句，定语从句中又包含了宾语从句。
是的，英语就是这么恶心。

Answer 2

we absolutely must do是作i believe的定语

is to reduce the amount we use our cars 是句子的谓语

简化后就是The first thing we must do is to reduce the amount of cars

Answer 3

The first thing主语 is to reduce the amount we use our cars是主句
i believe we absolutely must do是定语从句，省略that追问

那定语从句中 怎么会有believe和 must do 两个 谓语呢？

追答

..we absolutely
must do ...是.I believe 的宾语从句。

Answer 4

你分析错了，此句的主干句应为：The first thing（主语) is (系动词）to reduce the amount we use our cars（表语）。而i believe we absolutely must do才是丁宇从句中的从句，用来修饰The first thing追问

那定语从句中 怎么会有believe和 must do 两个 谓语呢？

追答

看来你基本概念都没搞懂，什么叫谓语，什么叫助动词，什么宾语，什么叫从句什么叫主句，你把基本概念弄懂了再来看吧，不然怎么说你都不明白的

Answer 5

The first thing（主语） (which或者thata) i believe we absolutely must do 这些是定语

is(谓语）

to reduce the amount（宾语） we use our cars 定语追问

那定语从句中 怎么会有believe和 must do 两个 谓语呢？