快速英语学习：比较since和for

　　快速英语学习比较since跟for

　　　　 Since 用来说明动作起始时间，for用来说明动作持续时间长度。 CopyRight .com

　　　　 I have lived here for more than twenty years. 内容来自

　　　　 I have lived here since I was born.. CopyRight .com

　　　　 My aunt has worked in a clinic since 1949.　 内容来自

　　　　 Some new oilfields have been opened up since 1976. 内容来自

　　　　 I have known Xiao Li since she was a little girl.　 CopyRight .com

　　　　 My brother has been in the Youth League for two years.　 CopyRight .com

　　　　 I have not heard from my uncle for a long time. CopyRight .com

　　　　留心：并非有for 作为时间状语的句子都用现在完成时快速英语学习点。

　　　　 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.　　　 内容来自

　　　　　 (当初我仍在这里工作。)

　　　　快速英语学习小窍门：　当当初实现时+一段时光，这一结构中，咱们用下面的公式转化，很容易就能打消非连续动词在实现时中的误使。

　　　　 1)　(对) Tom has studied Russian for three years.

　　　　　 = Tom began to study Russian three years ago, and is still studying it now.

内容来自

　　　　 2)　(错) Harry has got married for six years.

　　　　　 = Harry began to get married six years ago, and is still getting married now. 内容来自

　　　　显然，者快速英语学习点中的第二句过错，它应改为 Harry got married six years ago.　或 Harry has been married for six years.