第十单元Unit 10 Ive had this bike for three years.Section ALanguage Goal：Talk about possessions and things around you.How long have you had that bike over there？Ive had it for three years. I learned how to ride a bike on it.那边的那辆自行车你买了多长时间了?我买了三年了!在它上面，我学会了如何骑自行车。辨析for和sincefor其后只能接表示“一段时间”的名词性短语，可用多种时态。表示动作或状态持续的时间长短since其后接表示“时间点”的短语或从句(过去时)；也可以接“一段时间十ago”，常用于完成时态；还用于句型“its十时间段十since十一般过去时的句子”. 表示过去某个时间发生并持续至说话时的动作或状态I in this city for five years.
