下面是某英语教师在阅读课中导入部分与学生的互动。请回答以下问题教学片段:T: Do you like football?S1: Yes.
T: Which football teams do you like best?
S1: Now let me see ——OK, Hong Jing Long.
T: Well, in Wu Han, Chinese team, right? How about you? (面向另一名学生)
S2：Me too
T: You too? Who is your favorite player?
S2: …
T: (小声提示) Is it Chai Sheng?
S2: Yes.
T: Me too (上前与S2握手) Good friends, OK, thank you. So you know which is my favorite football team? Can you guess? I have a favorite football team. What is that? Can you guess? Just guess.
S3: I guess that…he is…
T: He is? I mean a football team.
S3: It’s the Manchester United.
T: Oh, Manchester United. That is my sister’s. My younger sister is crazy about Beckham, because he is very handsome, right? You know when he got married my sister was very, very sad. (学生笑)
T: But that is not my favorite one. My favorite team is Chine football team. Do you believe me? Yes or no?
Ss: Yes.
T: Really? You’re so good students. It’s very nice to hear you say so. If I ask my own students, “I like Chinese football team very much.” They will say, “Oh, no, please don’t do that. Chinese football team is terrible.” But I don’t think so. Now I’d like you to watch a video about Chinese football team. OK? OK, let’s watch it. (教师播放录像)
【简答题】
教师在课堂中分别扮演了哪几种不同的角色?（10分）