句型转换，按要求写出下列句子的变型。
1. This is my pencil.（变为一般疑问句并作否定回答）
_______ ________ _________ pencil? No, it isn’t.
2. this, crayon, your, ? is (连词成句)
_____________________
3. There are five rulers. (就划线部分提问)
__________ ___________ rulers?
4. This is a book. (就划线部分提问)
__________ _________?
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