设计任务：请阅读下面学生信息和语言素材，设计20分钟的英语写作教学方案。教案没有固定格式，但须包含下列要点：
●teaching objectives
●teaching contents
●key and difficult points
●major steps and time allocation
●activities and justifications
教学时间：20分钟
学生概况：某城镇普通中学高中二年级学生，班级人数40人。多数学生已经达到《普通高中英语课程标准（实验）》六级水平。学生课堂参与积极性一般。
语言素材：

There is an increasing number of school violence happening recently which have exerted terrible influence on our school life.What can we do about it?Please write a passage of at least 120 words titled with "How to improve school safety?"
Key words:campus security guard

正确答案：

Teaching Contents:How to write an argumentation about school violence.
Teaching Objectives：
（1）Knowledge objectives
①Students will learn some new words and expressions，like bully，school violence，guards，rebellious，pose a great danger to.…
②Students will know the structure of argumentation writing.
（2）Ability objectives
①Students will be able to give suggestions under the topic of school violence.
②Students can write an argumentation writing about school violence.
（3）Emotional objectives
①Students will recognize that school bullying is horrible and no one deserves to suffer from it.
②Students will understand that it's important for them to stand up against bullies together.
Teaching Key and Difficult Points:
(1) Teaching key point
Students will know how to write an argumentation, including the basic structure, arguments, etc.
(2) Teaching difficult point
Students can write an argumentation about school violence.
Major Steps:
Step 1 Warming up(2 minutes)
Play a short video report about the school violence happening recently. After the video, invite two students to share their opinions about it. Give corresponding comments and make a short conclusion that school bullying is absolutely horrible and we should act together to fight against it.
(Justification: Video is a powerful tool to reveal the truth and make students echo emotionally to this phenomenon.)
Step 2 Pre-writing(9 minutes)
(1) Divide students into groups of 4 to talk about the solutions towards this issue. And remind them that they can give solutions from different aspects, such as what should school do about this; what should parents do about this; and what should high school students do about this.
(2) Present students the written report of this video. Give I minute for them to read it, and then ask them to circle out the solutions recommended, as well as some key words and expressions under such topic.
(3) Ask students to write an argumentation writing based on this report. In their writing, they should cover the following information: what happened, why it happened, how to deal with it.
(4) Lead students to figure out the structure about the writing first. Then make a conclusion together that the first paragraph is about the phenomenon describing; the second paragraph is about the reasons and awful effects about this phenomenon; the third paragraph is about the solutions. Then give them an oral example.
(Justification: This step can prepare the students for structure as well as the contents of the writing.)
Step 3 While-writing(6 minutes)
Ask students to write down an argumentation under the topic of school violence in 6 minutes.
While writing, ask them to pay more attention to the spelling, grammar, and the logic of sentences.
(Justification: With all the preparation from pre-writing part, students will be able to write down the argumentation fast. In this step, students can practice how to organize their words, and they will learn to express their ideas logically.)
Step 4 Post-writing(3 minutes)
After students finish the writing, ask them to modify their draft by themselves, and then exchange their draft to do the peer editing.
(Justification: Peer editing helps students improve their ability to write and express their ideas by learning from each other.)

解析：

Teaching Contents:How to write an argumentation about school violence.
Teaching Objectives：
（1）Knowledge objectives
①Students will learn some new words and expressions，like bully，school violence，guards，rebellious，pose a great danger to.…
②Students will know the structure of argumentation writing.
（2）Ability objectives
①Students will be able to give suggestions under the topic of school violence.
②Students can write an argumentation writing about school violence.
（3）Emotional objectives
①Students will recognize that school bullying is horrible and no one deserves to suffer from it.
②Students will understand that it's important for them to stand up against bullies together.
Teaching Key and Difficult Points:
(1) Teaching key point
Students will know how to write an argumentation, including the basic structure, arguments, etc.
(2) Teaching difficult point
Students can write an argumentation about school violence.
Major Steps:
Step 1 Warming up(2 minutes)
Play a short video report about the school violence happening recently. After the video, invite two students to share their opinions about it. Give corresponding comments and make a short conclusion that school bullying is absolutely horrible and we should act together to fight against it.
(Justification: Video is a powerful tool to reveal the truth and make students echo emotionally to this phenomenon.)
Step 2 Pre-writing(9 minutes)
(1) Divide students into groups of 4 to talk about the solutions towards this issue. And remind them that they can give solutions from different aspects, such as what should school do about this; what should parents do about this; and what should high school students do about this.
(2) Present students the written report of this video. Give I minute for them to read it, and then ask them to circle out the solutions recommended, as well as some key words and expressions under such topic.
(3) Ask students to write an argumentation writing based on this report. In their writing, they should cover the following information: what happened, why it happened, how to deal with it.
(4) Lead students to figure out the structure about the writing first. Then make a conclusion together that the first paragraph is about the phenomenon describing; the second paragraph is about the reasons and awful effects about this phenomenon; the third paragraph is about the solutions. Then give them an oral example.
(Justification: This step can prepare the students for structure as well as the contents of the writing.)
Step 3 While-writing(6 minutes)
Ask students to write down an argumentation under the topic of school violence in 6 minutes.
While writing, ask them to pay more attention to the spelling, grammar, and the logic of sentences.
(Justification: With all the preparation from pre-writing part, students will be able to write down the argumentation fast. In this step, students can practice how to organize their words, and they will learn to express their ideas logically.)
Step 4 Post-writing(3 minutes)
After students finish the writing, ask them to modify their draft by themselves, and then exchange their draft to do the peer editing.
(Justification: Peer editing helps students improve their ability to write and express their ideas by learning from each other.)