my parents often go to work at seven.怎样变否定句和疑问句

my parents don't go to work at seven.一般疑问句：Do your parents often go to work at seven?对时间提问：when do your parents often go to work?对事情提问：what do your parents often do at seven?对人物提...那she goes to school at half seven.怎么改捏she goes to school at half past seven.她七点半上学she goes to school at half seven.怎样变否定句和疑问句