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1、19.Even if we start reducing the amount of carbon dioxide and other greenhouse gases,the climate(气候) is going to keep on warming for decades or centuries.,keep doing / keep on doing 均表示“继续做某事，反复做某事”， 可互换，只是 a) keep on 强调间隔性和动作的反复性，及不顾警告,困难,反对等仍然坚持要做下去。 1) 2) 3)keep on reading 并不是说一直不停地读书,这期间可以停顿. b)
2、 表示连续不断的动作，或后跟静态V,宜用keep doing . 1)She kept waving to her husband until he was out of sight. 2)Keep lying here; I will be back soon. 3)keep reading 一直在看书(没有停过,没有休息,没有做其它事) 4)Why do the dogs keep barking?这些狗为什么不停地叫？,c) 若表示今后或将来继续做某事,宜用keep on doing (如课文例句)。 1)We must keep on working hard in the comin
3、g new year. 2)He kept on smoking though we advised him to stop to smoke.,The boy _ asking questions all the time. In those years, Marx _studying English and using it. Dont _asking such questions ! 4)The boy _ asking some silly questions in class.,keep,kept on,keep on,kept (on),5) They _ watering the field until they got a good harvest. 6) You _making the same mistakes. 7) They _standing outside the room during all the meeting. 8)He _ smoking after the doctor told him to stop.,kept,keep on,kept,kept on,