成三英语语法必备：比较since和for

2010-08-05 00:00:00来源：旺旺英语

　　2010年下半年学位英语统考11月进行

　　成人英语三级考试语法必备：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 have lived here for more than twenty years.
　　
　　I have lived here since I was born..
　　
　　My aunt has worked in a clinic since 1949.　
　　
　　Some new oilfields have been opened up since 1976.
　　
　　I have known Xiao Li since she was a little girl.　
　　
　　My brother has been in the Youth League for two years.　
　　
　　I have 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 have worked here for many years.　　　
　　　
　　(现在我仍在这里工作。)

　　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。
　　
　　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.

　　历年考试真题
　　2010年5月北京成人英语三级考试A卷
　　2010年5月北京成人英语三级考试B卷
　　2009年11月北京地区成人英语三级考试(A)卷
　　2009年上半年北京成人英语三级真题（A卷）
　　2009年上半年北京成人英语三级真题（B卷）