There wasn't a mobil phone on the desk just now.改为复数

There wasn't a mobil phone on the desk just now.改为复数 There is a computer game on the desk 改为复数 there is a book on the desk改为复数句 Is there a watch on the desk?改为复数句 There were some pencils on the desk just now改为一般疑问句 There were some colourful pencils on the desk just now.改为一般疑 There were some pencils on the desk just now (改为一般疑问句) the phone is on the desk.=there is a phone on the desk. The headmaster wasn't on the train_arrived just now A./ B.in There were some diaries on the desk just now. the diary wasn't there .(改为复数句) were there a piece of paper on the teacher's desk just now?中