教材分析：
This teaching period mainly deals with the grammar: tag questions.
This period carries a considerable significance to the cultivation of students’ spoken English. The teacher is expected to enable students to master this period thoroughly and consolidate the knowledge by doing some exercise of good quality.
教学目标与核心素养：
1. Get students to have a good understanding of the basic usages of tag questions.
2. Enable students to use the basic phrases structures flexibly.
3. Develop students’ speaking and cooperating abilities.
4. Strengthen students’ great interest in grammar learning.
