(
课件网) Unit 1 Food matters Grammar & Usage To-infinitives as subjects and predicatives Step1: Review non-finite verbs（非谓语动词） Differenciate the parts of a sentence Non-finite verbs 本宫不死，尔等永远是妃位(非谓) 句 子 Proudly reading my words, I glanced around the room, only to find my classmates having big smiles on their faces and tears in their eyes. 1. He refused to help me. 2. Our parents expect us to go to a good university. 3. He is always the first to come. 4. I am happy to see you. 5. To finish the work on time is difficult. 6. My dream is to go to a good university. 主语 subject 宾语 宾补 定语 状语 表语 predicative Step2: Reading Read the blog entry(博客文章) and fill in the following mind map. In the past, the author liked to eat at (1)_____ . a restaurant The author was eager to try new restaurants. To eat out was also a social activity (2)_____with friends. to enhance the relationship Then the author came across a cooking app last month In the last few weeks, the author has been engaged in home making. Cooking home is (3)_____. The author can cook exactly what he wants. Cooking st home is (4)_____. cheaper healthier reasons benefits A. Exploring the rules Find the sentences that use to-infinitives as subjects or predicatives. A. Exploring the rules To-infinitives as subjects 动词不定式作主语 To eat out was also a social activity, ... To-infinitives as predicatives 动词不定式作表语 ..., my first thought at mealtimes was to eat at a restaurant. My plan is to invite my friends over at the weekend ... ..., it was not that difficult to make a simple and tasty dish. Working out the rules When the to-infinitive is used as a subject, we usually use the preparatory subject (1) at the beginning of the sentence. The to-infinitive can also be used as a predicative. It usually comes after the verb (2) . it be A. Exploring the rules ① ② ③ ④ Identify functions of the to-infinitive in the following sentences from the blog entry of Part A. (1) I was eager to try new restaurants. (2) To eat out was also a social activity, allowing me to enhance the relationship with my friends. (3) There are a variety of recipes in the app to choose from. (4) My plan is to invite my friends over at the weekend to show them my new-found skills. object complement 宾补 attributive 定语 adverbial of purpose 目的状语 adverbial of reason 原因状语 Step4: Presentation Rule1：单个不定式做主语时谓语动词一般用_____(单数/复数)形式 To say is one thing and to do is another. 说起来容易做起来难。 动词不定式作主语 到哪里去度假以及何时去度假还没有决定。 Where to go on a holiday and when to go for the holiday have not been decided. 到哪里去，何时去度假还没有决定。 Where and when to go on a holiday has not been decided. Rule2：两个及以上不定式作主语时，谓语动词用_____形式；但作为一个整体时，谓语动词用_____形式。 复数 单数 动词不定式作主语 1.It is a shame to litter(v扔垃圾). 2.It took me an hour to repair my bike. 3.It’s ... ...
