How often write letters to your mother 错在哪里?为什么错?_英语解答

How often write letters to your mother 错在哪里?为什么错?

人气：138 ℃　时间：2019-11-09 14:56:50

解答

没有助动词do 和主语.
正确的应该是
How often do you write letters to your mother?