外研版（2019）选择性必修一Unit5 Revealing nature Using language 课件（共26张PPT）
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| 名称 | 外研版（2019）选择性必修一Unit5 Revealing nature Using language 课件（共26张PPT） |  | |
| 格式 | pptx | ||
| 文件大小 | 13.0MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2025-01-10 12:27:52 | ||
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(共26张PPT)
Unit 5
Revealing
nature
Using language
Past perfect
BY MICHELLE
① Look at the sentences from the reading passage and answer the questions.
1. In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”
2. In sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”
3. What does the structure had done indicate
It indicates the action happened before a certain past action.
Now look for more sentences with the past perfect tense in the reading passage, and summarise its use in your own words.
1. It was a young man who had left medical school without completing his degree.
2. ... he had recently received a letter from his father predicting that he would be “a disgrace to yourself and all your family.
3. After Darwin had spent some time in South America, his room on the ship was crowed with samples of the plants and animals he had collected.
4. At that time, people believed that all species had appeared on Earth at the same time, and had not changed since.
5. It seemed their beaks had evolved according to what food was available on that particular island.
6. Over time, it had slowly evolved into many new species.
Grammar: Past Perfect Forms
The past perfect is formed using had + past participle. Questions are indicated by inverting the subject and had. Negatives are made with had not.
Statement: You had studied English before you moved to New York.
Question: Had you studied English before you moved to New York
Negative: You had not studied English before you moved to New York.
肯定句 主语＋had＋过去分词＋其他
否定句 主语＋ had＋not＋过去分词＋其他
一般疑问句 Had＋主语＋过去分词＋其他？
特殊疑问句 特殊疑问词＋had＋主语＋过去分词＋其他？
Summary
Grammar: Past Perfect Uses
表示在过去某一时刻或某个动作之前已经发生或完成的动作或存在的状态。这个过去的时刻常用by, before, until等引导的短语或时间状语从句来表示，也可以通过一个表示过去的动作或上下文来表示。
By nine o'clock last night, we had finished most of the work.
She had learnt about 500 English words before she went to middle school.
Grammar: Past Perfect Uses
表示过去某一时间之前发生的动作或存在的状态一直持续到那时，并可能继续下去，常同由for或since引导的表示一段时间的短语或从句连用。
I had been at the bus stop for 30 minutes when a bus finally came.
She said she had made great progress since she came here.
Grammar: Past Perfect Uses
在含有定语从句的主从复合句中，如果主从复合句叙述的是过去的事，则先发生的动作常用过去完成时。
She returned the book that she had borrowed.
The twins, who had finished their homework, were allowed to play badminton on the playground.
Grammar: Past Perfect Uses
过去完成时常常用在宾语从句(或间接引语)中，这时从句谓语表示的动作发生在主句谓语表示的动作(过去时)之前。
I thought that I had seen him before.
I was sent to the village last month to see how the development plan had been carried out in the past two years.
Grammar: Past Perfect Uses
在含有时间、条件、原因、方式等状语从句的复合句中，若主从句动作的发生有先后顺序，动作在前的要用过去完成时，动作在后的要用一般过去时。
I had finished cooking dinner before you came back.
I found the lecture hard to follow because it had started when I arrived.
Grammar: Past Perfect Uses
want, hope, mean, plan, intend等动词的过去完成时可以用来表示过去未曾实现的想法、希望、打算或意图，意为“本来……”。
I had hoped to be back last night, but I didn't catch the train.
We had intended to come and see you.
Grammar: Past Perfect Uses
过去完成时常用于某些固定句型：
在“hardly...when/ no sooner...than/ scarcely...when”句型中， 主句用过去完成时，从句用一般过去时。
I had no sooner reached home than it began to rain. ＝No sooner had I reached home than it began to rain.
It was＋一段时间＋since从句(从句用过去完成时) 。
It was at least three months since I had left Beijing.
Grammar: Past Perfect Uses
过去完成时常用于某些固定句型：
It was the first/second/...time＋(that)从句 (从句用过去完成时)。
It was the first time that I had chatted online in English.
by the time＋表示过去的从句＋主句(过去完成时)。
By the time I got to the station, the train had already gone.
by the end of＋表示过去的时间＋句子(过去完成时)。
By the end of last term we had learned 10 units.
Grammar: Past Perfect Uses
过去完成时用于虚拟语气中，在wish, as if/as though, if, if only, would rather sb. had done sth.结构或从句中，常用过去完成时来表示与过去事实相反的假设。
If he had caught the early bus this morning, he would not have been late for class.
I would rather she hadn't done that.
Grammar: Difference from the Simple Past Perfect
过去完成时在时间上强调“过去的过去”，
而一般过去时强调过去某一特定的时间。
They had arrived at the station by ten yesterday.
They arrived at the station at ten yesterday.
在没有明确的表示过去的时间状语作标志时，谓语动词表示的动作发生的时间先后须依据上下文来判断：先发生的用过去完成时，后发生的则用一般过去时。
She was very happy and her whole family were pleased with her, too. She had just won first prize in the composition competition.
② Complete the paragraphs with the information from the given sentences.
began
had led to
developed
chose to
had made
③ Complete the online encyclopaedia entry with the correct form of the words in the box.
arrived
had lived
eaten
had introduced
competed
declined
Compete decline eat
Live introduce arrive
④ Work in pairs. Act out a role-play using the information in Activity 3. One of you will play the keeper of Lonesome George, and the other will play the reporter asking about George. Use the past perfect tense where appropriate.
⑤ Listen to the podcast and choose the statements that are made.
Biodiversity
1 Biodiversity is important.
2 Bacteria are always harmful to humans.
3 Some species of bacteria are used in food production.
4 Many species of bacteria recycle dead organic matter.
5 Our immune systems are able to fight off all germs.
⑥ Listen again and complete the fact sheet.
made up of cells
bricks that are used to build houses
thirty trillion
thirty-nine trillion
help with digestion
break down
⑦ Complete the boxes with the expressions from the podcast.
Do you know about......
Have you heard of ......
By the way......
Actually......
In fact,......
Speaking of which,…
Checking background knowledge
Adding information
⑧ Read the passage and answer the questions.
What species are mentioned and what is special about them
What other unusual life forms do you know of
Two species are mentioned: the blue whale and the water bear.
The blue whale is the largest animal species on Earth, which can grow up to almost 30 metres in length and weigh over 130,000 kilos.
The water bear is probably the toughest species, which can survive temperatures from 150 C to a below freezing -272 C.
⑨ Complete the paragraphs with the correct form of the words and expressions in the box.
is home to
are native to
scientific
habitats
ecosystem
appearance
primitive
ancestor
⑩ Work in pairs. Look at the pictures of the species native to different regions of China. Talk about biodiversity in China using the words and expressions in this section. Do online research to find more information.
Review past perfect tense.
Do further research on biodiversity in China and share your ideas with your friends.
THANKS FOR WATCHING
Unit 5
Revealing
nature
Using language
Past perfect
BY MICHELLE
① Look at the sentences from the reading passage and answer the questions.
1. In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”
2. In sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”
3. What does the structure had done indicate
It indicates the action happened before a certain past action.
Now look for more sentences with the past perfect tense in the reading passage, and summarise its use in your own words.
1. It was a young man who had left medical school without completing his degree.
2. ... he had recently received a letter from his father predicting that he would be “a disgrace to yourself and all your family.
3. After Darwin had spent some time in South America, his room on the ship was crowed with samples of the plants and animals he had collected.
4. At that time, people believed that all species had appeared on Earth at the same time, and had not changed since.
5. It seemed their beaks had evolved according to what food was available on that particular island.
6. Over time, it had slowly evolved into many new species.
Grammar: Past Perfect Forms
The past perfect is formed using had + past participle. Questions are indicated by inverting the subject and had. Negatives are made with had not.
Statement: You had studied English before you moved to New York.
Question: Had you studied English before you moved to New York
Negative: You had not studied English before you moved to New York.
肯定句 主语＋had＋过去分词＋其他
否定句 主语＋ had＋not＋过去分词＋其他
一般疑问句 Had＋主语＋过去分词＋其他？
特殊疑问句 特殊疑问词＋had＋主语＋过去分词＋其他？
Summary
Grammar: Past Perfect Uses
表示在过去某一时刻或某个动作之前已经发生或完成的动作或存在的状态。这个过去的时刻常用by, before, until等引导的短语或时间状语从句来表示，也可以通过一个表示过去的动作或上下文来表示。
By nine o'clock last night, we had finished most of the work.
She had learnt about 500 English words before she went to middle school.
Grammar: Past Perfect Uses
表示过去某一时间之前发生的动作或存在的状态一直持续到那时，并可能继续下去，常同由for或since引导的表示一段时间的短语或从句连用。
I had been at the bus stop for 30 minutes when a bus finally came.
She said she had made great progress since she came here.
Grammar: Past Perfect Uses
在含有定语从句的主从复合句中，如果主从复合句叙述的是过去的事，则先发生的动作常用过去完成时。
She returned the book that she had borrowed.
The twins, who had finished their homework, were allowed to play badminton on the playground.
Grammar: Past Perfect Uses
过去完成时常常用在宾语从句(或间接引语)中，这时从句谓语表示的动作发生在主句谓语表示的动作(过去时)之前。
I thought that I had seen him before.
I was sent to the village last month to see how the development plan had been carried out in the past two years.
Grammar: Past Perfect Uses
在含有时间、条件、原因、方式等状语从句的复合句中，若主从句动作的发生有先后顺序，动作在前的要用过去完成时，动作在后的要用一般过去时。
I had finished cooking dinner before you came back.
I found the lecture hard to follow because it had started when I arrived.
Grammar: Past Perfect Uses
want, hope, mean, plan, intend等动词的过去完成时可以用来表示过去未曾实现的想法、希望、打算或意图，意为“本来……”。
I had hoped to be back last night, but I didn't catch the train.
We had intended to come and see you.
Grammar: Past Perfect Uses
过去完成时常用于某些固定句型：
在“hardly...when/ no sooner...than/ scarcely...when”句型中， 主句用过去完成时，从句用一般过去时。
I had no sooner reached home than it began to rain. ＝No sooner had I reached home than it began to rain.
It was＋一段时间＋since从句(从句用过去完成时) 。
It was at least three months since I had left Beijing.
Grammar: Past Perfect Uses
过去完成时常用于某些固定句型：
It was the first/second/...time＋(that)从句 (从句用过去完成时)。
It was the first time that I had chatted online in English.
by the time＋表示过去的从句＋主句(过去完成时)。
By the time I got to the station, the train had already gone.
by the end of＋表示过去的时间＋句子(过去完成时)。
By the end of last term we had learned 10 units.
Grammar: Past Perfect Uses
过去完成时用于虚拟语气中，在wish, as if/as though, if, if only, would rather sb. had done sth.结构或从句中，常用过去完成时来表示与过去事实相反的假设。
If he had caught the early bus this morning, he would not have been late for class.
I would rather she hadn't done that.
Grammar: Difference from the Simple Past Perfect
过去完成时在时间上强调“过去的过去”，
而一般过去时强调过去某一特定的时间。
They had arrived at the station by ten yesterday.
They arrived at the station at ten yesterday.
在没有明确的表示过去的时间状语作标志时，谓语动词表示的动作发生的时间先后须依据上下文来判断：先发生的用过去完成时，后发生的则用一般过去时。
She was very happy and her whole family were pleased with her, too. She had just won first prize in the composition competition.
② Complete the paragraphs with the information from the given sentences.
began
had led to
developed
chose to
had made
③ Complete the online encyclopaedia entry with the correct form of the words in the box.
arrived
had lived
eaten
had introduced
competed
declined
Compete decline eat
Live introduce arrive
④ Work in pairs. Act out a role-play using the information in Activity 3. One of you will play the keeper of Lonesome George, and the other will play the reporter asking about George. Use the past perfect tense where appropriate.
⑤ Listen to the podcast and choose the statements that are made.
Biodiversity
1 Biodiversity is important.
2 Bacteria are always harmful to humans.
3 Some species of bacteria are used in food production.
4 Many species of bacteria recycle dead organic matter.
5 Our immune systems are able to fight off all germs.
⑥ Listen again and complete the fact sheet.
made up of cells
bricks that are used to build houses
thirty trillion
thirty-nine trillion
help with digestion
break down
⑦ Complete the boxes with the expressions from the podcast.
Do you know about......
Have you heard of ......
By the way......
Actually......
In fact,......
Speaking of which,…
Checking background knowledge
Adding information
⑧ Read the passage and answer the questions.
What species are mentioned and what is special about them
What other unusual life forms do you know of
Two species are mentioned: the blue whale and the water bear.
The blue whale is the largest animal species on Earth, which can grow up to almost 30 metres in length and weigh over 130,000 kilos.
The water bear is probably the toughest species, which can survive temperatures from 150 C to a below freezing -272 C.
⑨ Complete the paragraphs with the correct form of the words and expressions in the box.
is home to
are native to
scientific
habitats
ecosystem
appearance
primitive
ancestor
⑩ Work in pairs. Look at the pictures of the species native to different regions of China. Talk about biodiversity in China using the words and expressions in this section. Do online research to find more information.
Review past perfect tense.
Do further research on biodiversity in China and share your ideas with your friends.
THANKS FOR WATCHING