Unit4 Then and now教學內容：Part A Lets learn Find the mistakes一、教學目標：1、能聽說認讀單詞：dining hall、grass、gym、ago.2、能聽說認讀句子：There was no gym in my school twenty years ago. Now, there is one in our school.3、會唱歌曲Changes in me.二、教學重難點：1.能聽說認讀本課時單詞和句子.2.能正確使用一般過去時和一般現在時.三、教學準備：多媒體課件四、教學過程：Step1: Warming up師生進行簡單的問候，談一談自己的變化。Step 2.：Presentation1.教學單詞dining hall, grass, gym, ago(1)Show the picture of grass. T: Whats this? Ss: Its grass. 板書grass并教讀。 Chant: Grass, grass. Play football on the grass. 以同樣的方法教學dining hall, gym. Chant: Dining hall, dining hall. Have lunch in the dinning. Gym, gym. Play basketball in the gym.(2)教學單詞ago及詞組. years ago, . months ago. 教師先說幾個句子讓學生感受。T: I went fishing three days ago. I went to Beijing two years ago. 板書并教讀ago。 讓學生說出. years ago, . months ago的意思并造句。2.出示兩張新舊學校圖片介紹并板書：There was no gym in my school twenty years ago. Now theres a new one in our school. 教讀。學生學說句子，描述學校以前和現在的樣子.如：There was no computer room ten years ago. Now theres a new one in our school.3.Play the tape of Lets learn.學生仿讀。Step 3:Communication1.小組讀單詞，開火車讀單詞。2.學生靈活運用所學單詞句子。3.完成Find the mistakes.學生先自己讀句子，然后小組合作找出錯誤的地方。4.學唱歌曲Changes in meStep4: Consolidation and Extension教師出示幾組同一場景下不同時間段的變化，讓學生用There be句型講一講過去與現在的區別。Step5: Homework1.抄寫并背誦dining hall、gra