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初步了解句型What makes...dirty/messy?...make(s)...dirty/messy.以及What can we do to...?We can...
本课中四会及三会单词的正确读音
能运用所学词句复述或表演课文章节
教学过程：
Step 1 Greetings
Step 2 Pre-reading
1.Show some pictures of different cities.
T:Do you like this city? Why ?
S:Because it’s beautiful and clean.
T:Yes ,I like it,too.The river and the air are clean.
T:Do you like this city? Why?
S:Because it’s not clean/dirty.
T:It’s messy and dirty.新授messy 、dirty.板书
【设计意图】 通过图片和文字，让学生感受并试着说出干净和脏乱城市的区别。
2.Ask for Volunteers.
T:Now, Huai’an is establishing National Civilized City.(创建全国文明城市) Would you like to join us? To be a volunteer, you have two tasks:
(1).What makes our city dirty?
(2).What can we do to keep our city clean?
T:We don’t like the dirty city， so we should keep our city clean. (揭示课题) Keep our city clean
【设计意图】以淮安市争创全国文明城市为契机，征召志愿者，并对志愿者提出要求，激发学生探究问题的积极性。并引出课题。
Step 3 While-reading
1.Whatch and choose
（1） How is the city?
The city is beautiful and clean.
（2）What makes our city dirty?
A.clouds and water B.smoke and rubbish
【设计意图】让学生观看动画，初步感知课文，锻炼学生通过自读获取文章大意的能力。
2.Read and find. (快速阅读P58，完成下面的填空)
What makes … dirty?_____from cars and ______ from _______
make(s)