Unit 5 Revealing Nature Using language- 高二英语 同步精品课堂（外研版2019选择性必修第一册）

Period 2 Using Language 1 Uning language Step 1. When to use Past perfect Step 2. The difference between past perfect present perfect and simple past Step 3. Exercises 2 ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ Using Language 1. n.特征，特性 2. v.减少 3. n.陆龟 4. v.责怪，指责；把……归咎于 5. n.山羊 6. 源于……的，原产于…… 7. adj.原始的，低等的 8. adv. 遍及全世界 characteristic decline tortoise blame goat be native to primitive worldwide 单 词 清 障 3 Using Language 8. adj.巨大的，特大的 9. 巨型陆龟 10. n.红树（一种热带树木） 11. n.鬣蜥(一种大型热带美洲蜥蜴) 12. adj.梳状的 13. n.(动物的)刺，刺毛 单 词 清 障 ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ giant giant tortoise mangtove iguana comb-like giant 4 Using Language 原文再现 Darwin suspected that the finches had evolved from a common ancestor,... In this sentence the two actions both hanppened in the past, Action B happened first, Action A happened later. In this situation, past perfect is used to describe Action B and simple past is used to describe Action A . Action A happening first happening later Action B 5 Uning language Many people refused to believe that living things, including humans, had evolved from lower forms of life. 原文再现 happening later happening first The past perfect is a verb tense which is used to show that an action took place once or many times before another action / point in the past. 6 Uning language Past Perfect Forms The past perfect is formed using had + past participle. Questions are indicated by inverting the subject and had. Negatives are made with had not. Statement: You had studied English before you moved to New York. Question: Had you studied English before you moved to New York? Negative: You had not studied English before you moved to New York. 7 Uning language The past perfect expresses the