Unit 5 A Delicate World Period 2 Grammar课件- 2023-2024学年高二英语外研版（2019）选择性必修第二册

外研选择性必修 第二册 Unit 5 Period 2 Grammar 1 2 To know the usage of it as an empty object To use it as an empty object correctly 学习目标 目标一：To know the usage of it as an empty object Activity 1: Look at the sentences and answer the questions. Sentence (a) and (c) are from the reading passage. a. No visitor would think it surprising that the island is a UNESCO World Heritage Site. b. No visitor would think that island being a UNESCO World Heritage Site is surprising. c. Experts felt it necessary to come up with a plan to remove all the rabbits from the island. d. Experts felt to come up with a plan to remove all the rabbits from the island was necessary. 1 What does “it” refer to in the sentences (a) and (c)? “It” in sentence (a) refers to “the island is a UNESCO World Heritage Site”. “It” in sentence (c) refers to “to come up with a plan to remove all the rabbits from the island” 2 What is the difference between the sentences in each group? When the object of a sentence is a that-clause (b) or an infinitive (d), we sometimes use “it” as an empty object and put the real object later to keep balance. For example, sentence (a) uses “it” as the empty object of “think”, referring to the real object: “the island is a UNESCO World Heritage Site”. Sentence (b) uses that-clause as the object of “think”. Now look for more sentences with this structure in the reading passage, and summarise its uses in your own words. 1) This incident made it clear that rat, mouse and rabbit problem needed solving once and for all. ... Activity 2: Read the following sentences and summarise what can be used it as an empty object. 1 They felt it difficult to finish the work in such a short time. 2 He thought it absolutely senseless attempting the impossible. 3 I took it for granted that they would not come. Summary: 我发现，可以用it作形式宾语替代的成分有：______________，______________，______________。 不定式 动名词 从句 当不定式、动名词或从句在某个句子中做宾语时，为了保持句子的结构平衡，常用it作为形式宾语，而将真正的宾语放到句子的后部去。 【语法精讲】 1 it作为形式宾语可以分为两种情况： (1) 代表不定式。 例