Our class has a school trip on May 4th.改为否定句怎么改?对时间提问成疑问句呢?

问题描述:

Our class has a school trip on May 4th.改为否定句怎么改?对时间提问成疑问句呢?

Our class doesn't have as shcool trip on May.4th
when does your class have a school trip .