teaching aims:
a 能听说、认读long hair,short hair,strong,thin,quiet,friends.
b 能描述人物相貌特征，如：he has short hair,big eyes and a small nose.she has long hair and small eyes.等。
c 对学生进行关心朋友，朋友间要互相帮助的思想教育。
teaching emphasis and difficulties:
a emphasis：描述人物相貌特征的词汇。
b difficulties：quiet的发音
teaching materials：
1 the tape recorder and a tape.
2 some pictures.
3 cai
4 word cards.
学生情况分析
四年级学生的年龄在十----十一岁左右，生性活泼好动，喜欢直观形象思维，对游戏、竞赛、特别感兴趣。而且他们接触英语已经有一年半时间，已具有初步的听说能力.再来,在本单元a部分学生将会接触到介绍人物的诸多单词,我相信必能很好的调动学生学习积极性。
teaching procedures
step 1 warm-up
1、 greetings.
t: hi, children. long time no see.
s: hi, miss chen. long time no see.
t: how are you?
s: i"m fine, thank you. and you?
t: i am very well, thanks
2、let"s do
t:now,boys and girls.would you like to do with me?
ss:yes!
t:make yourself tall. ss:tall,tall,tall!
make yourself short. ss:short,short,short!
make your arms long. ss:long,long,long!
make your eyes big. ss:big,big,big!
make your eyes small. ss:small,small,small!
t:you have done a good job!
ss:thank you,miss chen!
{purpose: 以上的let"s do 的目的是为了复习旧知：tall,short,big,small等形容词，让学生温故而知新，为学习新知垫定了很好的基础。}
step 2 preview
1 t：class!let"s play a game.
ss:ok!
接下来做的是反义词游戏，教师说出一个形容词，如tall,请学生快速说出它的反义词，看看谁的反应快。
tall--short short---long big---small
2 let"s play:look and say
通过cai出示一个男孩与一个女孩的头象。男孩、女孩五官具有鲜明特征，如：
男孩：小眼睛，大鼻子，大嘴巴，短头发等。
女孩：大眼睛，小鼻子，小嘴巴，长头发等。
活动时，把全班分成若干组进行比赛，让各组分别来描述他们的特征。
{purpose:课前的revisions 让学生在一定程度上巩固了旧知识，反义词游戏为小学生善于展现自我的个性搭设了舞台；而let"s play既活跃了课堂气氛又直揭本课主题并为新知做好铺垫。}
step 3 presentation
1 教学long hair,short hair
a 引入：当let"s play中学生描述到头发hair的时候，教师提醒学生长头发是long hair,短头发是short hair.
b 操练：
cai呈现一个长头发的女孩和一个短头发男孩
t：this is a girl.she has long hair.
that is a boy.he has short hair.
look at me!i have ...(教师故意停顿下来，示意学生接话。)
ss:long hair.
t:you are so clever.yes,miss chen has long hair.what about you?(请一女生回答。)
s1:i have long hair.
t:good!do you have long hair,too?(问一男生。)
