Unit 5 Learning from nature Using language Grammar 课件-2023-2024学年高二英语外研版（2019）选择性必修第三册

Unit 5 Period 2 Grammar 课 堂 学 习 Review: non-finite forms as subject, object and predicative 1 Look at the sentences from the reading passage and answer the questions. a Today, architects continue to explore ways to capture the beauty of natural forms, ... b ... it appears to float above the waterfront promenade and the water that surrounds it. c Visitors are often amazed to find themselves in an urban building that so truly captures the beauty of natural forms. d Creating buildings such as these enables us to live in closer harmony with our environment. 1 Look at the “to do” structures in sentences (a) and (b). Do they serve the same function in each sentence? 2 In sentence (c), is the -ed form used as an adjective or a past participle? Why does the author use the -ed form other than the -ing form? No, they don’t. “To explore” in sentence (a) serves as object and “to float” in sentence (b) serves as predicative. The -ed form is used as an adjective. The author wants to describe the visitors’ feeling, so the -ed form is used. 3 What is the function of the -ing form in sentence (d)? The -ing form is used as subject. Now look for more sentences with these structures in the reading passage. 1. In fact, we are so used to them that we may even take them for granted without realising how much inspiration they have given us. 2. It is natural to think in this way,... 3. People whose interest is exploring the relationship... 4. To use biomimicry is to create structures... 【语法讲解】 非谓语动词，又叫非限定动词，共有三类：不定式、分词（现在分词、过去分词）和动名词。非谓语动词在句中不可单独做谓语，不受主语的人称和数的限制，它在句中可以用作其他成分，如主语、宾语、表语等。 作主语：Roller skating on rough pavement invites accidents. 作宾语：He avoided talking about this. 作表语：My idea is to rent a bicycle. 动词-ing形式作主语常用来表示经常性或习惯性的动作且通常放在句首。 e.g. a. Fishing is my pleasure. (钓鱼是我的爱好。) b. Talking mends no holes. (空谈无济于事。) 动词-ing形式作主语时，需要注意以下两点。 1) 谓语动词用单数形式。 e.g. a. Reading aloud is vital to learn a second language. (大声朗读对于学习第二语言是很重要的。) b. Seeing is b