题目内容
【题目】There is a book on the desk． (改为否定句)
Therea book on the desk．
【答案】isn't
【解析】句意：桌上有一本书。there be句型变为否定句的时候就将be动词后加上not就可，is not的缩写形式为isn't，故填isn't。
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题目内容
【题目】There is a book on the desk． (改为否定句)
Therea book on the desk．
【答案】isn't
【解析】句意：桌上有一本书。there be句型变为否定句的时候就将be动词后加上not就可，is not的缩写形式为isn't，故填isn't。