高中英语教学课件：选必3U1语法：不定式作表语.pptx

Infinitives as the predicative;Read the following sentences taken from the text on pages 2, 3 and 8. Discuss with your partner the structure of the sentences and underline the subject and the infinitives. ;1. Perhaps the best way to understand Western art is to look at the development of Western painting over the centuries. 2. During the Middle Ages, the purpose of Western art was to teach people about Christianity. 3. In this work, Monets aim was to convey the light and movement in the scene… 4. What they attempted to do was no longer show reality, but instead to ask the question, “What is art?” 5. Our goal is to display the Chinese artistic genius from ancient times.;;1. 不定式作表语时，描述主语的具体内容、性质、特征或目的担当句子主语的名词，大多用于表示某种情形或状况：advice, aim, custom, business, desire, difficulty, duty, experience, habit, happiness, hope, idea, intention, job, method, plan, principle, problem, purpose, reason, risk, role, task, thing, wish, ambition等。例如： The best way is to join an English club. 最好的办法是加入一个英语俱乐部。 A college counsellor’s job is to help students adjust to college life. 大学辅导员的工作是帮助学生适应大学生活。 His ambition is to become an astronaut.??? 他的理想是成为一名宇航员。 ;2. 当句子的主语是不定式时，系动词后可接不定式作表语，用于解释主语所描述的行为或说明该行为带来的结果。例如： To weep is to risk appearing sentimental. 哭泣就是冒着显得伤感的风险。 To argue with him is to challenge his authority. 和他争论就是挑战他的权威。 To see is to believe. 眼见为实。 ;3. 当主语含定语从句且其先行词为代词all或形容词最高级the least, the most时，后可接“系动词+不定式” 作句子的表语。例如： All he wanted was to be left alone. 他只想一个人呆着。 The least I can expect is to have this day all to myself. 我至少能期待的是自己完全拥有这一天。 4. 当不定式作表语时，句子主语可以使what引导的主语从句。例如： What he hoped was to be admitted into the university. 他希望能被大学录取。;不定式作表语;不定式作表语 注意事项;动词不定式的否定式 不定式的否定式是not / never to do...；例如： The secret is not to get involved. 秘诀是不要介入。 My intention?is not to?shock anybody. 我本意不是要震惊任何人。 The important decision?is never to?give up working for each others benefit. 重要的决定是永远不要为彼此的利益而放弃工作。;【注意】 动词-ing