I have a knife and a ruler.→I don't have a knife or a ruler. 3.a lot of (=lots of)变为many或much。如：
They have a lot of friends.（可数名词）→They don't have many friends.
There is lots of orange in the bottle.（不可数名词） →There isn't much orange in the bottle. 4.already变为yet。如：
I have been there already.→I haven't been there yet.
练一练：
1、 It’s a book. (改一般疑问句)
2、 对划线部分提问) 3、 Do you watch TV every Sunday? (做肯定回答)
4、 This picture is very beautiful. （改为以what引导的感叹句） 5、 Kick the ball to me! (改为否定句) 6、（对划线部分提问）
7、 There are some orange trees on the farm. (改为单数句子)