句子 It’s better to do sth rather than .还是 than

句子 It's better to do sth rather than .还是 than
1.句子It's better to do sth rather than do sth. 这句子对吗,怎么看怎么别扭,有比较级为什么要用rather than 而不是 than ? 应该是It's better to do sth than do sth. 如果要用rather than ,用在It's important to do sth rather than do sth. 我使用的对吗?
2.再者,关于than 后接 to do 还是do 的问题.
It's better to do sth than to do sth . than 后面接 to do 还是 省略to 直接接 do?我认为句中的to 可以省略.
To do sth is better than to do sth.此句,是否正确?than只能接to do ,并且to 不能省略
It's important to do sth rather than do sth. 还是 than to do sth?

It's better to do sth rather than do sth 这句子对,rather than意思是而不是
It's important to do sth rather than do sth 也对
It's better to do sth than to do sth .中 than 后面 不省略to 因为t's better to do sth than to do sth=To do sth is better to do sth
To do sth is better than to do sth.此句,正确 than只能接to do 表比较,并且to 不能省略
It's important to do sth rather than do sth.中不能是 than to do sth