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【答案】
【1】 are they They are reading a book.
【2】 is John He is eating lunch.
【3】 are they They are having math class.
【4】 is she She is doing morning exercises.
【解析】
根据例句可知句型为:—What is/are…doing? —…is/are doing…
【1】图片是两个人在看书。要问她们正在做什么?她们正在看书。看书read a book,read的现在分词是reading,主语they,用are,故答案为are they;They are reading a book.
【2】图片是约翰在吃午饭。要问John正在做什么?他正在吃午饭。吃午饭eat lunch,eat的现在分词是eating,主语John,用is,故答案为is John;He is eating lunch.
【3】图片是在上数学课。要问他们正在做什么?他们正在上数学课。上数学课have math class,have的现在分词是having,主语they,用are,故答案为are they;They are having math class.
【4】图片是一个女生在做早操。要问她正在做什么?她正在做早操。做早操do morning exercises,do的现在分词是doing,主语she,用is,故答案为is she;She is doing morning exercises.