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【答案】
【1】—Is Jim reading? —No, he isn’t.
【2】They are singing under the tree.
【3】—Where are the girls playing? —On the playground.
【解析】
【1】该句是一般疑问句,主语Jim是第三人称单数,故用is提问,因为提问的是现在正在发生的事情,故动词read(读)要用动词-ing形式reading,故问句为Is Jim reading?由is引导的一般疑问句,否定回答为No, 主语+isn’t. 故答案为—Is Jim reading? —No, he isn’t.
【2】该句是现在进行时,其结构为主语+be+doing,根据主语they可知,系动词用are,under the tree意为“在树下”,故答案为They are singing under the tree.
【3】该句是特殊疑问句,主语the girls是复数,故系动词用are,提问地点用where,系动词are后接动词-ing形式,故play用动词-ing形式playing,故问句为Where are the girls playing? playground意为“操场”,on the playground意为“在操场上”;故答案为—Where are the girls playing? —On the playground.