题目内容
7．Be quiet!The patientsare sleeping（ sleep）．分析 保持安静!病人正在睡觉．
解答 答案：are sleeping
根据"Be quiet!"可知，此处意为"病人正在睡觉．"，这句话时态为现在进行时．现在进行时的构成为"am/is/are+现在分词"，因主语"patients"为复数，故答案为are sleeping．
点评 做这道题时应根据句子判断出句子的时态，然后写出其适当形式．
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