英語的應用越來越廣泛了，我們必須好好來學習英語知識。對此國小頻道編輯為大家整理了國小六年級英語語法講解：比較since和for。詳情如下：
Since用來說明動作起始時間，for用來說明動作延續時間長度。
I have lived here for more than twenty years.
I have lived here since I was born.
My aunt has worked in aclinic since 1949.
Some new oil fields have beeno pened up since1976.
I have known XiaoLi since she was a little girl.
My brother has been in the Youth League for two years.
Ihavenotheardfrommyuncleforalongtime.
注意：並非有for作為時間狀語的句子都用現在完成時。
I worked here for more than twenty years.
(我現在已不在這裡工作。)
I have worked here for many years.
(現在我仍在這裡工作。)
小竅門： 當現在完成時+一段時間，這一結構中，我們用下面的.公式轉化，很容易就能排除非延續動詞在完成時中的誤使。
1) (對)Tom has studied Russian for three years.
=Tom began to study Russian three years ago, and is still studying it now.
2) (錯)Harry has got married for six years.
=Harry began to get married six years ago, and is still getting married now.
顯然，第二句不對，它應改為Harry got married six years ago. 或Harry has been married for six years.
希望大家能夠認真閱讀這篇國小六年級英語語法講解：比較since和for，以便在英語學習上取得優異的成績。
