Step1.Warming up: Free talk.
T: Hello, boys and girls.
Ss: Hello, Mr. Liu.
T: Last week, we have learned the conversation of Unit 9, Do you know which fish is the biggest?
Ss: The green fish is the biggest.
T: Yes, The green fish is the biggest. Can you remember the word biggest?
Ss: b-i-g-g-e-s-t. （教师板书单词）
T：big –bigger- biggest small –smaller –smallest ……
Ss ：big –bigger- biggest small –smaller –smallest ……
（通过对上节课的知识提问，顺利衔接到复习单词环节，板书并把最高级单词的构成用红色粉笔加粗，通过小组比赛的方式认读单词，激发学生学习兴趣，进一步加深学生对单词的印象。）
Step2.Target.
T: Look at the letters- est, read after me /ist/.
Ss: /ist/
T: biggest.
Ss: biggest.
T: Look at this picture. What’s the biggest animal in the world?
S1: It’s the whale.
T: Yes, The whale is the biggest.
T: Repeat. What’s the biggest animal in the world?