His earphones were on the desk just now.改为否定句：改为一般疑问句：肯定回答：否定回答：
问题描述：
His earphones were on the desk just now.改为否定句：改为一般疑问句：肯定回答：否定回答：
答
his earphones were not on the desk just now.
were his earphones on the desk just now?
yes,they were.
no,they were not.
答
His earphones were not on the desk.
Are his earphones on the desk?
Yes/No, his earphones were/were not on the desk (Yes: just now)
答
否定句：His earphones weren't on the desk just now.
一般疑问句：Were his earphones on the desk just now?
肯定句回答：Yes,they were.
否定句回答：No,they weren't.