固安暑假高中英语家教
培训地址：固安县106国道东侧建行南100米 佳诚文化
固安暑假高中英语家教
课程和辅导方案请咨询：185-3163-1983 (微信同号) 微信号：guanEnglish
辅导编号：May05- 2019
高中英语家教/初中英语家教/小学英语家教
固安县暑假英语家教
以课本为基础 又高于课本，着重提高学生的英语听说读写的能力，为学生的英语学习打下坚实的学习基础。
初中英语教学讲解实例:比较since和for
Since 用来说明动作起始时间，for用来说明动作延续时间长度。
I h***e lived here for more than twenty years.
I h***e lived here since I was born..
My aunt has worked in a clinic since 1949.
Some new oilfields h***e been opened up since 1976.
I h***e known Xiao Li since she was a little girl.
My brother has been in the Youth League for two years.
I h***e not heard from my uncle for a long time.
注意:并非有for 作为时间状语的句子都用现在完成时。
I worked here for more than twenty years.
(我现在已不在这里工作。)
I h***e worked here for many years.
(现在我仍在这里工作。) 培训地址：固安县106国道东侧建行南100米 佳诚文化
小窍门: 当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。培训地址：固安县106国道东侧建行南100米 佳诚文化
1) (对) Tom has studied Russian for three years.
= Tom began to study Russian three years ago, and is still studying it now.
2) (错) Harry has got married for six years.
= Harry began to get married six years ago, and is still getting married now.
显然，第二句不对，它应改为 Harry got married six years ago. 或 Harry has been married for six years. 培训地址：固安县106国道东侧建行南100米 佳诚文化
13. since的四种用法
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I h***e been here since 1989.
2) since +一段时间+ ago
I h***e been here since five months ago.
3) since +从句
Great changes h***e taken place since you left.
C***iderable time has elapsed since we h***e been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
培训地址：固安县106国道东侧建行南100米 佳诚文化