Unit 4 Discovering Useful Structures 课件-2022-2023学年高一英语人教版（2019）必修第三册

Unit 4 Space Exploration Grammar Step 1. Lead in---Pair work Look at the following sentences and focus on the italicized infinitives. In pairs, discuss their functions. 1.I trained for a long time to fly airplanes as a fighter pilot.. 2.As we all know, an astronaut needs to be healthy and calm in order to work in space.. 作目的状语 作目的状语 3.First of all, you must be intelligent enough to get a related college degree. 4.Some scientist were determined to help humans realise their dream to explore space.. Summary: 1. 不定式的结构：to+do原形。 2. 分析上面的句子，我们知道在描述太空探索时，动词不定式不仅可以用来表目的，还可以用来作定语，表修饰。 作目的状语 作定语 Presentation Yang Liwei thought little of his personal life to focus on his work. Tianwen-1 is China's first mission to land on Mars. 动词不定式作定语和状语 1. 动词不定式作定语常放在名词或不定代词后面作后置定语, 表示尚未发生的动作。 Let us give him something to eat. 让我们给他一些吃的东西。 We have much homework to do tonight. 今晚我们有很多作业要做。 Step 2. 动词不定式用作定语 2. 名词前有first, last, next, only等词以及最高级修饰时, 其后要用动词不定式。 She was the first woman to win the gold medal in the Olympic Games. 她是第一个在奥运会中赢得金牌的女性。 3. 抽象名词attempt, ability, chance, desire, determination, decision, plan, way或不定代词something, nothing等后面常用不定式作后置定语。 But Janis Adkins has the ability and desire to do useful work. 但是詹尼斯·阿德金斯有能力和愿望去做有用的工作。 4. 当名词与定语之间存在动宾关系时。 I usually have a lot of meetings to attend. 我通常有很多会议要参加。 She is a nice person to work with. 她是一个很好的合作伙伴。 5. 当名词与定语之间存在主谓关系时。 We must find a person to do the job. 我们必须找到一个人来做这项工作。 We need someone to go and get a doctor. 我们需要有人去请医生。 6. 当名词与定语有同位关系时。 We got the order to leave the city. 我们接到了离开这个城市的命令。 (1) The airport ______________(complete) next year will help promote tourism in this area.   (2) Do you have anything _____(do) tonight?   (3) The best way __________(improve) your English is to join an English club.   to be completed to do to improve Step 3 Practice 动词不定式在句中作状语, 主要用来修饰动词和形容词, 也可用来修饰副词。在句中, 不定式可作目的状语、原因状语、结果状语、条件状语等, 可表示目的、原因及结果等。 1. 目的状语, 置于句首或句末, 置于句首时常表示强调。为加强语气, 常与in order或so as 组成短语。 A group of young peop