Unit 3  What were you doing when the UFO arrived?

　　Teaching key point: the usage of the past continuous tense

　　Teaching difficulties:

　　How to use the past continuous tense in the adverb clause of time leaded by "when"and "while".

　　The Analysis of Teaching Process

　　Step 1 - - - Organization

　　1. Exchange greetings with the Ss.

　　Duty report: It is between two students. They are having a dialogue.

　　Enjoy a clip of film about the UFO

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