used to be 与used to do一般疑问句两种【肯定否定】

肯定句：主语+used to be一般疑问句：Did + 主语+ use to be否定句： 主语+ didn't + use to be 主语+used not to be肯定句：主语+used to do一般疑问句：Did + 主语+ use to do否定句： 主语+ didn't + use to do 主语+ used not to do