首先，如果你要问“你怎么不去学校用英语怎么说”，这句话本身就有些奇怪。如果你想要问的是“你为什么不去学校学习英语”，那么你可以这样表达：Why don't you go to school to learn English?
如果你想要更加严谨地表达这个问题，你可以这样说：What are the reasons why you are not attending school to learn English? 或者更加正式的表达方式是：May I inquire as to the reasons why you have not enrolled in a formal English language education program at a school or institution?
接下来，我想强调一下，学习英语并不一定非要去学校。现在有很多其他的途径可以学习英语，比如在线课程、自学、参加英语角等等。所以，如果你想要询问某个人为什么没有学习英语，你可以这样问：What are the reasons why you have not pursued English language education through alternative methods, such as online courses, self-study or English language clubs?
最后，如果你想要了解某个人对于学习英语的态度和计划，你可以这样问：What is your current attitude towards learning English and what steps are you taking to improve your language proficiency? 或者更加正式的表达方式是：May I inquire as to your current approach towards English language acquisition and the measures you are taking to enhance your language proficiency?
总之，如果你想要表达一个问题，尤其是在正式场合，你需要使用准确、严谨、礼貌的语言。同时，你也需要注意语法、拼写和标点符号等方面的细节，以确保你的表达清晰、易懂、有逻辑性。
