Unit5 Revealing nature Period3 Grammar 教学设计-2023-2024学年高中英语外研版（2019）选择性必修第一册

外研版（2019）选择性必修一Unit 5 Revealing nature Grammar教学设计 课型 Grammar 课时 1课时 主题 语境 人与自然——认识自然、探索自然 内容 分析 本部分通过文本的语句，帮助学生总结归纳过去完成时的用法并通过对袁隆平、孟德尔实验以及对龟的介绍，巩固语法及词汇知识。 教学 目标 1. 了解并掌握过去完成时的概念、特点及用法，并能够在真实语境中灵活运用； 2. 掌握过去完成时与一般过去时的区别。 教学 重点 引导学生进一步了解并掌握过去完成时的概念、特点及用法。 教学 难点 引导学生掌握过去完成时的用法。 教 学 过 程 Step 1: Lead-in 1. Look at the sentences from the reading passage and answer the questions. (1) In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”? (2) In sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”? (3) What does the structure had done indicate? 2. Now look for more sentences with the past perfect tense in the reading passage, and summarize its use in your own words. 教师引导学生观察例向并归纳总结过去完成时的特点。 Step 2: Discovering the rules Past perfect 【1】表示在过去某一时刻或某个动作之前已经发生或完成的动作或存在的状态。这个过去的时刻常用by, before, until等引导的短语或时间状语从句来表示，也可以通过一个表示过去的动作或上下文来表示。 By nine o'clock last night, we had finished most of the work. She had learnt about 500 English words before she went to middle school. 【2】表示过去某一时间之前发生的动作或存在的状态一直持续到那时，并可能继续下去，常同由for或since引导的表示一段时间的短语或从句连用。 I had been at the bus stop for 30 minutes when a bus finally came. She said she had made great progress since she came here. 【3】在含有定语从句的主从复合句中，如果主从复合句叙述的是过去的事，则先发生的动作常用过去完成时。 She returned the book that she had borrowed. The twins, who had finished their homework, were allowed to play badminton on the playground. 【4】在含有时间、条件、原因、方式等状语从句的复合句中，若主从句动作的发生有先后顺序，动作在前的要用过去完成时，动作在后的要用一般过去时。 I had finished cooking dinner before you came back. I found the lecture hard to follow because it had started when I arrived. 【5】want, hope, mean, plan, intend等动词的过去完成时可以用来表示过去未曾实现的想法、希望、打算或意图，意为“本来……”。 I had hope