can you please teach me how to make popcorn 为什么要加to

问题描述:

can you please teach me how to make popcorn 为什么要加to

疑问词后面要么接一个完整的句子,要么接动词不定词,即 to +动词原形.例如:
I don't know where to go on vacation.
我不知道去哪儿度假.