资源简介

(共23张PPT)
frightened
in fear
keep quiet
mentioned
Because of
refused
One night, Tina woke up at midnight and saw a yellow light dive towards the ground. …
Tina and Tom hid behind bushes and tried to keep quiet. …
Later, they told their father about the aliens, …
Read the summary of the story on page 117. Pay attention to the words in bold. Then answer the questions.
Read the summary of the story on page 117. Pay attention to the words in bold.Then answer the questions.
1.Why was there a loud noise last night
2.Why couldn’t the spaceship fly
The spaceship couldn’t fly because of the damage.
There was a loud noise because a spaceship crashed in the forest.
Because a spaceship crashed in the forest, there was a loud noise.
Because of the damage, the spaceship couldn’t fly.
__________________
When do we use because / as / since When do we use because of
When do we use a comma(,)
Let’s sum up the rules!
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_______________________
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Let’s sum up the rules!
Are because, since and as used in the same way
What is the difference between because, since and as when expressing reasons
类别 连接词/结构 语法功能 语气与位置特点 例句
原因 状语 从句 because/ as/ since 后接完整句子 because强调直接原因（用于回答Why引导的问句）；as/since侧重已知前提。 从句位于主句之前时，需加逗号；从句位于主句之后时，无需逗号。 –Why was there a loud noise
–Because a spaceship crashed.
Because a spaceship crashed, there was a loud noise. / Since no one saw the aliens, their father refused to believe them.
原因 短语 because of 后接名词(短语) 或代词 表原因，不可接完整句子。 The spaceship couldn’t fly because of the damage.
The police officer asked Tom some more questions about the aliens. Match the questions with the answers. Then use them to complete the officer’s notes with as , since, because or because of. Remember to write complete sentences.
Let’s practise!
Tina was sure that something landed in the forest near the hills because of a loud noise last night.
Tina and Tom hid behind some bushes because they heard some voices speaking a strange language.
Tina and Tom ran away as an alien saw them and made a terrible noise.
Since no one else saw these aliens, Tina and Tom’s father refused to believe them.
Let’s practise!
because we don’t know enough about it
because of the fast-developing technology
because they are well written and exciting
because of its amazing special effects
Because/As/Since Mars is the closest planet to the Earth
Because/As/Since space travel is often dangerous
because so much of the universe is unexplored
because /as/since there will be lots of amazing things out there
Let’s practice!
Grammar in use
Do you think aliens exist Why or why not Read the news headlines and discuss the questions in pairs.
Grammar in use
Use your imagination. Complete the sentences. Use because / as / since / because of to give fun and creative reasons.
1. The math textbook pages turned blank ...
2. The school principal grew dragon wings …
3. All the computers started singing ...
4. The ketchup in the kitchen became blue …
… because the maths problems were tired of being solved and decided to escape.
Grammar in use
(1)The lake was dangerous. They avoided it. (because)
(2)There was a lot of smoke. It was difficult to see anything. (Because of)
(3) We have lost our map. We had better ask for directions. (Since)
(4)The spaceship couldn’t land. The weather was too bad. (because / because of)
Use because / as / since / because of to combine the sentences.
Grammar in use
Use because / as / since / because of to combine the sentences.
(1)The lake was dangerous. They avoided it. (because)
(2)There was a lot of smoke. It was difficult to see anything. (Because of)
They avoided the lake because it was dangerous.
Because of the smoke, it was difficult to see anything.
Grammar in use
Use because / as / since / because of to combine the sentences.
(3)We have lost our map. We had better ask for directions. (Since)
(4)The spaceship couldn’t land. The weather was too bad. (because / because of)
Since we have lost our map, we had better ask for directions.
The spaceship couldn’t land because the weather was too bad.
The spaceship couldn’t land because of the bad weather.
____________ (Because/For) it’s raining heavily, we have to cancel the picnic.
Nathan must be ill, ____________ (because/for) he is absent today.
—Why did Justin refuse to go with us
—____________ (Because/Since) he is busy preparing for the exam.
The flight was put off ____________ (because/because of) the weather was terrible.
The flight was put off ____________ (because/because of) the terrible weather.
More practice
从括号中选择最合适的词填空。
Because
for
Because
because
because of
The traffic was heavy. We were late for school.
Jeff didn’t get the job. He was short of experience.
The weather was perfect. We decided to have a picnic.
I’m going to the supermarket. We need milk and eggs.
Betty practises the piano every day. She wants to become a great pianist.
More practice
将所给的两个句子改写为一个完整的句子。
We were late for school because/since/as the traffic was heavy.
Because/Since/As the traffic was heavy, we were late for school.
Jeff didn’t get the job because/since/as he was short of experience.
Because/Since/As Jeff was short of experience, he didn’t get the job.
We decided to have a picnic because/since/as the weather was perfect.
Because/Since/As the weather was perfect, we decided to have a picnic.
I’m going to the supermarket because/since/as we need milk and eggs.
Because/Since/As we need milk and eggs, I’m going to the supermarket.
Betty practises the piano every day because/since/as she wants to become a great pianist.
Because/Since/As Betty wants to become a great pianist, she practises the piano every day.
More practice
阅读文章，从表格内选择正确的连词填空。
My biggest dream is to become an astronaut and explore the universe. I am deeply interested in space ____________ it is full of mysteries. There are so many unknowns waiting for us to discover, like black holes or dark matter. ____________ the amazing science films I’ve watched, I have learnt a lot about planets and stars.
____________ space might be dangerous, I am not afraid. I study science and maths very hard so that I can do well in space exploration. My friends think this dream is tough, for it requires a lot of knowledge and courage.
If I can fly to space one day, I will take pictures of the Earth. It must look beautiful, ____________ it is our home. From up there, I imagine I’ll see bright blue oceans, green lands, and white clouds. I want to share that amazing view with everyone, so they can realize how wonderful our planet is. I believe my dream can come true, ____________ I will never give up.
I know it will be a long journey, but I will keep trying because exploring space is my greatest dream.
because
although and because because of for
Because of
Although
for
and
Self-assessment
评价内容 评分（1-5）
1. 我能理解because，as，since和because of的含义和用法。 1 2 3 4 5
2.我能在具体情境中正确使用原因状语从句或短语because of 陈述原因。 1 2 3 4 5
3.我能发现和总结原因状语从句和短语because of的使用规律，并运用规律举一反三。 1 2 3 4 5
4. 我能根据已知结果，用原因状语从句或短语because of写出符合逻辑的原因。 1 2 3 4 5
Homework
基础作业：
用思维导图总结原因状语从句和短语because of的用法, 并为每个用法配一个例句。
拓展作业：
设计一个关于“Could there be life on other planets ”的调查问卷，询问班级同学对是否存在外星人的看法，用because， as， since或 because of记录原因。

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