This is a big school.改为复数句

This is a big school.改为复数句 This is a big family.改为复数句,请速回! This hat is big.改为复数句 this apple is vety big.改为复数句 is this school big and beautiful改为肯定句 this is a big strawberry.（改为复数） Is this a bus （改为复数句 this is a pencil改为复数句 This is a shirt .改为复数句 this is a pen.改为复数句 this is a letter改为复数句 this is a tree 改为复数句