资源看点：学习语法：现在完成进行时。话题：talk about how long you have been doing things.

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How long have you been collecting shells ?
1a.Groupwork.Discuss these questions.
How long did you sleep ?
When did you start class today ?
How long have you been in class today ?
1b  listen. A reporter is talking to the participants in a skating marathon. Fill in the chart below
1c.Ask and answer questions about the people in the picture.
A: How long has Alison been skating?
B: She’s been skating for five hours.
A: How long did Sam skate?
B: He skated for four hours