四年级英语上册Unit 2 Part B Lets Learn公开课教学设计一、教学目标1.能够听、说、认读本课时主要生词twenty-one-fifty.2.能够听懂歌谣，并按照节奏念出该歌谣：How many English books do you have? Thirty! Thirty! Thirty!3.了解Story time中的故事。二、教学重、难点1.会说数字：21-50，特别注意thirty, forty和fifty的发音2.针对本课时的难点Story time，要求教师正确讲解故事内容，使大部分学生能够理解故事，并引导基础好的学生表演故事。三、课前准备1.教师准备主要人物的头饰（Zoom和它的妈妈）以及两摞英语书、一摞语文书、一摞数学书。2.教师准备一台录音机和相关录音带。3.学生准备数词卡片。四、教学步骤Step1:Warm-up（1）Part A of Lets do.（2）Practice：A: I have a new pen.B: Really? What color is it?A: Guess!B: Is it red?(3) 复习字母J到N，以及以这些字母开头的单词。(设计意图：上课伊始，就让学生在轻松自在的英语环境中感受学习的乐趣，为整节课打好基础。)Steop2: Presentation（1） The teacher lead the students do： Show me your pencil. Show me your ruler（2）The teacher ask the students：How many pencils can you see？Then lead them to answer：I can see three pencils.（3）Let the students to ask other students.Presentation of the new words:Teacher take out many books and say ：I have so many books: English books, Chinese books and math books. How many English books can you see? Lets count together. The teacher can ask the students to count the books，and teach the new words：thirty, forty and fifty. 并让学生注意到这些单词结尾有-ty，特别需要注意区分thirteen和 thirty，fourteen和 forty， fifteen和 fifty读音之间的区别。（设计思路：利用实物，让学生感知新授知识，学习起来比较轻松，而且有助于学生轻松理解。）