Question

You must do it even if you don't want to.

You must do it even if you don't want to.
可以写成：
You must do it even if you don't want to do.
或
You must do it even if you don't want.
吗？
为什么？

Answer 1

want
要, 想要[+to-v][O2][O7][O8][O4]
I don't want my daughter taken out after dark. 我不愿有人在天黑以后带我女儿外出。
He wants you to see him in London without fail. 他要你务必在伦敦见他。
Somebody wants to see you. 有人想见你。
want 后面要么加 to do sth
要么加 sth
而do 后面要加sth
所以，一定要改的话，可以是
You must do it even if you don't want to do it.
但就很累赘了。呵
至于最后一句，want后面不加 to do 的话是某一件事物，在这里前面说的是do it，而不是sth 或it, 所以不对。

Answer 2

不能, 因为want to在这里是一个单词, 而do是多余的, 可以省略掉

Answer 3

You must do it even if you don't want to.
可以写成：
You must do it even if you don't want to do.
但是，加了do 很不地道，用第一句最好。
You must do it even if you don't want.不符合语法结构，want to do sth, 必须要有to do sth.
You must do it even if you don't want to.是老美最喜欢用的，应为习惯吧

Answer 4

你必须要做，即使你不想去做