1. 解释说明：
Simply put,Let's put in this way
2. 总结归纳：
Now to sum/wrap up my speech
3. 劝解指令：
You should have done sth.better
4. 启发思考：
Come on ,you are supposed to know this
5. 强调要点：
leae bear in mind that...
6. 提醒注意：
Are you with me?
7 .纠正口误：
Wait a minute, I made a slip of tongue
提问目的：to define/to describe/to illustrate/to explain/to introduce/to emphasize/to compare/torecommend