They are on the bed怎么改成一般疑问句?

They are on the bed怎么改成一般疑问句? There are some books on the bed改成一般疑问句 they are on the sofa改成一般疑问句 把They are making the bed.改成否定句,一般疑问句,回答 there are some skirts on the bed改成一般疑问句,做否定和肯定回答. （1）They are on the bed（改为一般疑问句,作肯定回答） They are on the bed.改为一般疑问句,并作肯定回答 His backpack is on the bed.(改成一般疑问句)怎么改 They are on the sofa. (改成一般疑问句,并作否定回答) There are somepictures on the bed.改为一般疑问句 His keys are on the bed.改为一般疑问句. his chines ebooks are on the bed 改为一般疑问句