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Unit 6  How long have you been collecting shell ?

　　Teaching goals:

　　1.      Words and expressions in this unit .

　　2.      现在完成进行时的用法。

　　3.      Patterns: How long have you been doing sth ?

　　I have been doing sth since … .

　　I have been doing sth for … (period of time) .

　　4.      谈论人们做某事持续多长时间。

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