预设与生成是一个相互依存、彼此促进、和谐统一的整体,没有课前的精心预设就不可能有课堂的精彩生成。精彩生成虽说具有一定的偶然性,但更多的则是精心预设的必然结果。“凡事预则立,不预则废。”一方面,教学是有目标、有计划的活动,预设是有效组织课堂教学不可或缺的重要环节。没有充分预设的课堂教学,是很难令人满意的。另一方面,预设并不是为了给我们的课堂教学提供一个 The presupposition and formation are an interdependent, promoting each other, harmonious unity, without the pre-class preset can not have the wonderful generation of the classroom. Although the wonderful generation has a certain chance, but more is the inevitable result of careful pre-set. "On the one hand, teaching is a goal, planned activities, presupposition is an essential part of the effective organization of classroom teaching. Not fully pre-defined classroom teaching is difficult to satisfy. On the other hand, the default is not to provide one for our class teaching