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To talk about recent events in space travel tith the present perfect and already, just and yet.
教学步骤：
1.Warming up
Look at the picture and talk about what can you see in the picture.
Sing a song .
2.listening(activity1&2)
.Before listening ,read the words together.
.Play the recording twice and check the answers together.
.Play again and ask some students to read their answers.
3.Review the new words
.Look at some pictures and read the words together
4.Activity3&4
.Read the questions together.
.5 minutes for them to read the dialogue and find the answers.
.Play the recording twice and check the answers by asking some students.
.Role play.5minutes for them to pratice the dialogue with their partner,then choose 3 pairs to read the dialogue.Find out which pair is the best.
.3 minutes for them to finish activity4,then check the answers together.
5.Pronunciation and speaking(Activity5)
.Tell them how to find the stresses by reading the words on screen.
.2minutes for them to find the streesses of each sentence.
.Read the sentences on the screen together.
6.Sumarise
现在完成时的用法，句子结构，just, yet, already的用法。
7.Homework.(Activity6)