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Present Continius: They are buying extra food/ They aren't buying extra food/Are They buying extra food?
Present Perfect: They have bought extra food/They haven't bought extra food/ Have They bought extra food?
Past Simple: They bought extra food/ They didn't buy extra food/ Did They buy extra food?
Past Perfect: They had bought extra food/ They hadn't bough extra food/ Had They bought extra food?
Past Continious: They were buying extra food/ They weren't buying extra food/ Were They buying extra food?