These_________ _________math books．
[主观题]These are interesting story books．（改为单数句型）______________________________
Alice is reading some interesting books about trees now. (改为否定句)Alice reading in
[主观题]That is a bag．（改为否定句）________ ________a bag．
[主观题]That is my watch．（改为否定句）________ ________ my watch．
[主观题]1 like the blue sweater，（改为否定句）________ ________ ________the blue sweater．
[主观题]A．ll of the students like football.(改为否定句)_____ of the students _____ football.
[主观题]Those maps are on the wall．（改为否定句）Those maps_________ on the wall．
[主观题]B．oth Mary and John are students．（改为否定句）
[主观题]③他今天必须去上班。改为双重否定句：______
[问答题] 什么是否定句？什么是双重否定句？