Unit10 I’ve had this bike for three years.Section A 3 GrammarShow TimeLet’s have a yard sale!GrammarGrammar Focus1. 那边的那辆自行车你买了多长时间了？ 我买了3年了。2. 他的儿子拥有那套轨道火车多长时间了？ 自他四岁生日起，他就拥有它了。3. 你曾经踢过足球吗？ 是的，我很小的时候踢过，但我现在已经有一时间 不踢了。How long have you had that bike over there?I’ve had it for three years.How long has his son owned the train and railway set？He’s owned it since his fourth birthday.Have you ever played football?Yes, I did when I was little, but I haven’t played for awhile now.表示从过去已经开始持续到现在的动作或状态，可以和表示“从过去某一时刻延续到现在的一时间状语”连用，如for与since引导的时间状语。Present Perfect Tense现在完成时for与 since都能与现在完成时连用，但区别较大：(3) 二者可以转换: for+一时间 = since+一时间+ago He has studied English since 2000. He has studied English for five years. e.g. 他已经学习英语5年了。(1) for + 一时间e.g. 自2000年以来他一直在学习英语。(2) since + 过去时间点/ since five years agoe.g. 从我6岁起，我就拥有了这辆自行车。I have had this bike since I was six years old. (4) since能引导时间状语从句 (主句用现在完成时，从句用一般过去时)，而for则不能。for 和 since 在现在完成时中的应用 含有for，since的现在完成时的用法歌诀: 过去的动作或状态，一直持续到现在， for / since 把时间带。歌诀即学即练选择for或since填空：1. I have been here _____ five months ago.2. He has been a soldi |
