根据题目要求完成下列任务，用中文作答。
1. 以下是一位老师在进行词汇教学时的情景：
Step 1导入(Leading in)PPT播放歌曲，师生共同演唱。
T: Let’s sing the song “Who Is Wearing Yellow Today”.音乐结束后，教师并没有停下来，而是改编歌词继续唱。
T: Who is wearing blue today? Blue today? Blue today? Who is wearing blue today? Blue today?
Step 2新授 (Presentation)
T: Who is wearing blue today?
S: You are wearing blue today.
T: Yes, I’m wearing blue today. I’m wearing a blue sweater now.学生跟读sweater, sweater, blue sweater
T: I like the blue sweater. If you like it, please say it out loud.PPT展示粉红色毛衣图片
T: Do you like the pink sweater?
S: Yes, I like the pink sweater.（借助学生穿着的服装，引出jacket等新词，展开活动）
T: It is too hot. I’ll take off my sweater. Please take off your jacket.
（伴随动作，一次教授词组：take off, put on, hang up和put away）根据以上所给的教学案例，回答下面问题。
16【简答题】
教师在导入及新授环节创设了不同情境，请分别对其创设方法及作用进行分析。（15分）