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Step Two: Grammar Focus
1. Use PPT to review the sentences in 1a.
2. Read through the sentences in Grammar Focus.
3. Summery: Work in groups to summery the grammer.
a. 过去进行时的意义
b. 过去进行时的构成
c. 动词－ing 的变化规律
Step Three: Pair work 4a
1. Work in pairs to make sentences with the information in 4a.
2. Call several pairs to read out the sentences.
3. Find out how to use when and while. Give them 3 minutes to discuss the differences between when and while.
4. Use PPT to get the grammar.
Step Four: Practice
1. Complete 4b.
2. Call several students to check the answers.
3. Read the passage loudly and carefully.
4. Notice: right away 立刻，马上， because of 因为，由于
icy adj. 原形： ice n.
Step Five: Pair work
1. Work in pairs to get the information.
2. Give a report use the information.