do sth to do/doing sth这个后面的to do/doing sth都是后置定语吗?区别在哪?

do sth to do/doing sth这个后面的to do/doing sth都是后置定语吗?区别在哪?
do sth to do/doing sth这个后面的to do/doing sth都是后置定语吗?区别在哪?

do sth to do/doing sth这个后面的to do/doing sth都是后置定语吗?区别在哪?
like what?
close the window to keep warm/close the window to keeping the````room warm?
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我知道你说的是什么但是当初自己也没学好这一节

to do是双宾语吧。