used to be 与used to do一般疑问句两种【肯定否定】

问题描述:

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