正确答案:
一般疑问句:Do they start lessons at sever o'clock?
否定回答:No, they don't.
一般疑问句改为疑问句只要找出助动词do和does等,再根据要求变化,此题是一般现在时态的句子改为疑问句且主语为复数的‘’they‘’,则找助动词do,提前至句首并首字母大写,做否定回答时一般为No,主语+助动词(do或does等)+not,所以该题为
Do they start lessons at sever o'clock?
No, they don't
Do they start lessons at sever o'clock?
No, they don't.