问几个英语？？？

How much is it?
How much does it cost?

to一般接动词原形,但有时候作介词,需要接ing形式
比如 look forward to your coming
be devoted to teaching

Don't 跟动词原形

COST
TO后面是跟动词原形
DON‘T后面是跟动词原形

句子有问题：
应该是：How much does it cost?