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Scientists have also discovered many other galaxies in the universe.
None of them has an environment like that of the earth.
Why has no one communicated with us?
2．教学难点
（1）在语境中理解现在完成时和一般过去时的区别
教学辅助
Ppt mp3
教学方法
task-based approach, situational teaching 引导法
教学内容
教学活动
设计意图
教师活动
学生活动
Step?1?
Revision & lead-in
Play a game
Hand out some cards (each card has a word connected to the planets in the solar system) then?ask?them?to?put?the?
Sun and the eight?planets at?the?right?
place. The best group with get some prize.
Ask?students?to?work?in?groups?to?
discuss the?question:
Have?we?found?life?on?other?seven?
planets?yet??If?not,?why?
Then lead to this lesson: Unit?2?We?
haven’t?found?life?on?other?planets?yet.
通过动手操作的游戏活动，将较难掌握的天体名称以生动有趣的形式呈现给学生，可以活跃课堂气氛，提高学生的兴趣，同时检查了学生的预习情况。
通过问题的讨论，为后面的文章学习做好了相关知识的储备，使得学生学起来更轻松愉快。
Step 2: Pre-reading
1.Vocabulary