内容介绍：New words1. forget to do和forget doing区别 forget to do 忘记要去做某事。 (未做) forget doing 忘记做过某事。 (已做) e.g. The light in the office is stil on. He forgot to turn it off.办公室的灯还在亮着，它忘记关了。(没有做关灯的动作) He forgot turn