How often write letters to your mother 错在哪里?为什么错?
问题描述：
How often write letters to your mother 错在哪里?为什么错?
答
缺少成分
应改为 How often do you write letters to your mother ?
希望对你有帮助~
答
缺少主语
应该成how often do you write letters to your mother
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?