改变句子。20′ (1)We have some oranges.(单数) (2)These are rubbers. (3)John has a big lemon. (4)I have a glass.(复数) (5)Those are green ballpens.(单数) (6)Mary has a nice book.(一般疑问句,否定回答) (7)Is this a plane? Yes, it is.(复数) (8)They are teachers.(单数) (9)These are jeeps. They’re green.(合成一句)