文档介绍：Ask and answer:
Do you like collecting stamps?
How long have you been collecting stamps?
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Collect shells
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Collect coins
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Collect stamps
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Collect kites
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Collect toy animals
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Read the sentences:
long did you sleep last night?
did you start class today?
long have you been in class today?
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Pairwork:
A:How long have you been skating?
B:I have been skating since I was seven years old.
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How long has she been puter?
(four hours)
She has been puter for four hours
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How long has he been playing baseball?(two hours)
He has been playing baseball for two hours.
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