关于Not untill的用法
Not untill做为否定词置于句首应该采用部分倒装,可是到底是怎么使用呢 比如：
他直到中学时才开始学英语：
是该说：
Not until he went to middle school did he start studying English.
还是说：
Not until did he went to middle school,he started studying English.