Unit4 Space exploration Discovering Useful Structures 课件-2022-2023学年高中英语人教版（2019）必修第三册

Discovering Useful Structures Lead in How many infinitives are there in the sentence? to help to explore space Scientists were determined to help humans realise their dream to explore space. realise 2 3 1 OK， Let's read this sentence and see how many infinitives there are in the sentence. Infinitives means 动词不定式 in Chinese. they are verbs that are not influenced by tenses or subject. There are altogether 3 infinitives. We can put them into two groups, one is with to, the other without to. Teaching objectives: By the end of this period, you will be able to… 1. identify and analyze the usage of infinitives as adverbials and attributes ; 2. master the usage of infinitives as adverbials and attributes through self-study and practice. 3. use infinitives to describe space facts and efforts to explore space. Review The text is mainly about the development of the space. Read to find Underline all the sentences with infinitives in the text in each paragraph. eg: "Are we alone? What's out there?" Looking up at the stars, people have always wanted to learn more about space,and scientists work hard to find answers.They make vehicles to carry brave people into space to find out the secrets of the universe.B They also really wish to discover other planets that are suitable enough to support life. Read to find "Are we alone? What's out there?"【① Looking up at the stars, people have always wanted to learn more about space,and scientists work hard to find answers.】【②They make vehicles to carry brave people into space to find out the secrets of the universe.】B【 ③They also really wish to discover other planets that are suitable enough to support life.】 Para.1 Before the mid-20th century,most people felt traveling into space was an impossible dream.【④However,some scientists were determined to help humans realise their dream to explore space.】 D After many experiments,they succeeded in making rockets that could escape Earth's gravity.On 4 October 1957,the Sputnik 1 satelli