Unit 10I’ve had this bike for three years
Present perfect tense with since and for Grammar Lesson: for and since1
现在完成时表示动作或状态在过去已经 开始，持续到现在可能还要持续下去， 常和 for, since 引导的表示一段时间的时 间状语连用，谓语动词多用延续性动词
如： live, teach, learn, work, study, be open, be closed, keep, have, be away, be married, be asleep, be ill 等
如： for twenty-three yearsI have worked here since 1991
since twenty-three years ago自从 1991 年以来我就在这儿工作
We have learned English for three years
since three years ago我们学英语 3 年了
注意： 1 ） since + 时间点， for + 时间段， 如： since last week, for two days
since 2012我买了这辆自行车三年了We have had this bike for three years
since three years agoFill in the blanks
— How long have you lived here
— I’ve lived here ____ twenty years
Yes, I’ve been here _____ 1976
We haven’t seen each other ______ last week
