请认真阅读下述材料，并按要求作答[图1]请根据上述材料完成下列任务：
依据拟定的教学目标，设计句型教学环节，并说明理由。
Warming up and Lead-inGreet students as usual and play a song about travelling. Ask them some questions like if you want to travel, what luggage should you bring? And lead students to answer the question and lead in the topic.（设计意图：通过播放歌曲和提出问题可以吸引学生的兴趣和注意力，发散思维并很自然过渡到本节课所学话题）PresentationShow some clips to teach “light, heavy, small, big...”; Show some real objects like cup and lead students to describe it: It’s heavy... It’s light...Then ask students to read the words and sentences one by one after the teacher in different ways.（设计意图：通过不同的方式呈现单词和句型，增加单词教学的趣味性，让学生更容易接受和掌握;利用实物呈现句型，活动的衔接性较好。）PracticeActivity 1 High and Low voiceLead students to read the sentences: It’s heavy... It’s light... on the blackboard. When teacher reads sentences in a low voice, students should read in a loud voice and vice versa.Activity 2 Do an antonym matchheavy bigsmall lightThen work in pairs to role play the dialogue.（设计意图：采用游戏的方式练习句型能够增强句型学习的趣味性，寓教于乐，增强单词的识记效果;通过连线的方式，不仅能够巩固句型还能锻炼学生的反应能力，也能锻炼学生的听力。）ProductionLet students make a dialogue by using some words about describing objects and sentence patterns in groups of two: It’s... and choose some groups as representatives to give a performance and teacher gives some positive comments.（设计意图：通过小组活动的方式培养学生的团队合作能力和团队意识，让学生将所学知识运用到日常生活中去，符合新课标培养学生的综合语言运用能力的标准。）
