It is a big map改为一般疑问句:Is it a big map?
陈述句改一般疑问句的方法:
一、含有be动词,通常把be动词调到句首。例如:
They are in the swimming pool.
Are they in the swimming pool?
二、含有情态动词,把情态动词调到句首。例如:
He can drive a car.
Can he drive a car?
三、含有实义动词,就需要借助助动词do,does(三单)、did(过去式)来构成疑问句。例如:
Amy speaks English.
Does Amy speak English?