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教学难点:
1.What do you usually do at 10 pm?及其回答I usually go to bed.
2.频度副词usually的用法。
教学过程：
Step1Warm –up
Say “Hello” to each other.Boys and girls Are you happy today? The first let’s sing a song
Before our new lesson let’s watch a video together.引出课题On duty
Step2Presentation
1.T:Are they great?I think the boys are handsome,the girls are so beautiful. Do you remember what do they usually do on their duty day?学习usually
2.T;Look at the screen.(出示遮盖动作的图片)What do you usually do ?(学习本单元重点句型)
3T.Listen to the tape and learn to these phrases：sweep the floor,clean the blackboard,,clean the windows,take out the trash 、open the door.
4.T:This time let’s ask the leading character:What do you usually do?学习clean the desks and chairs,
5.T:So many desks and chairs.Do you clean them by yourself?(学习By yourself)
S:My friends help me
T:Oh , you are good helpers.
6师领读本课词组，也可以Point and say.
Let’s play I “say it you do it”(游戏中反应快的小组予以奖励)
T：Boys and girls Helen is on duty this week.What does Helen usually do?Listen to the tape and answer these questions.(课件出示问题)
解决问题。
Listen again.Are you clear?
教师领读，学生组内分角色读。
Step3 Consolidation
1. 组内做Play and say
2.T When you are on duty,what do you usually do?Write your answer.
3.T:At school.you can help your teacher and your classmates.At home you should help your parents do some housework,OK?
Step4Summary
What have you learned?
Step5 Homework
Write five phases five times.
Help your parents do the housework.