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Teaching steps：
Before writing : 1、Play a video to lead in today’s topic .
T:What do you think of this English song ?...After listening to this song, I have a worry . I worry about that I will be homeless. Do you want to be homeless? Ss: No .（设计意图：用英文公益环保主题歌导入今天的话题，旨在让学生们放松，自然过渡到今天的写作主题）
Show some pictures on the screen to make students realize our
earth is in trouble and she hopes to be saved .
T:Our earth is getting into trouble .,right? Can you tell me who is destroying our earth ?
Ss: Humans.
T:Yes! What will you do to save our earth ?
Activity1， brainstorming: Students in teams say the most words about environmental pollution and protection as they can .The teacher writes down the words on the blackboards for each team.(设计意图：此活动任务简单，而且采取分组竞赛的活动形式，目的不仅考虑到整体学生的课堂参与率，而且通过这种方式让学生的大脑中复现出很多的与本课写作话题相关的单词，短语和句型，为下面的写作做准备！）
Activity 2：Connect words on the blackboard into sentences by competing among teams .（设计意图：用组与组之间竞争的方式让学生们用刚才出现在黑板上的单词和短语造句，为下面的写继续做好铺垫）
While-writing： 1、Read carefully to get the main idea of the passage about the environmental pollution and protection .
2、According to sentences which they made just now to choose
Proper sentences to finish writing this passage .
Work together to make their article more fluent.(设计意图：强 调团队意识，培养学生们的合作能力）
After-writing: 1、Invite one student from each team(There are four teams ) to
show their passages on the blackboard .
The teacher and students work together to give comments on
their articles on the blackboard .
According to the scores they have got, students and their teacher work together to find out which team is the winner .(设计意图：统计出每个小组的总得分，评选出整节课表现最佳的团队，掌声给出祝贺，这样的方式能够让很多的学生一直保持注意力集中的状态，培养了团队意识，更能够提高课堂效率，达到良好的教学效果。）
Writing :How to save our earth ?
Team 1 Team 2 Team 3 Team 4
Pollution protection reuse throw away
Ride bikes don’t cut down plant trees protect animals
...... ...... ...... .......
Writing :How to save our earth ?
Team 1 Team 2 Team 3 Team 4
Pollution protection reuse throw away
Ride bikes don’t cut down plant trees protect animals
...... ...... ...... .......
板书设计: