不一定,如果to是副词,就是原形.
如果是介词,就要加ing 形式.
She prefers working to doing nothing.
她宁愿干活,不愿闲着.
I'm not used to doing so.
我现在不习惯这样做.
这两句都是 介词.
to come to my room ; to go to school 这就都是副词.