根据要求转换句型。
[[QOrDeR]]This is my book.(改为否定句）
This __________ my book.
【小题2】There are some cats under the desk.(改为一般疑问句）
_______ there ________ cats under the desk?
【小题3】There are six pictures on the wall.(就画线部分提问〉
______________ pictures________________ on the wall?
【小题4】The black dog is under the bed .(就画线部分提问）
_____________ the black dog?
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