Задайте 5 вопросов: общий разделительный, альтернативный, к подлежащему или его определению, специальный ко второстепенному члену предложению. pupils are doing grammar exercises at the moment
Are pupils doing grammar exercises at the moment? What are pupils doing at the moment? When are pupils doing grammar exercises? Are pupils doing grammar exercises or reading at the moment? Pupils are doing grammar exercises at the moment, aren't they?