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since和for在英語語法里是很常見的考點。如果能夠掌握好它的運用方法，能夠使我們學習英語更加游刃有余。昂立外語幫助同學們整理了一些關于since和for用法的重點，供各位同學們參考學習。

Since 用來說明動作起始時間，for用來說明動作延續時間長度。

例如：I have lived here for more than twenty years.我住在這兒二十多年了。

I have lived here since I was born. 我從出生起就住在這兒了。

注意：并非有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. （我現在已不在這里工作。）

I have worked here for many years.（現在我仍在這里工作。）

注意：用句型轉換的方法，很容易排除非延續動詞在有for/since結構的完成時中的誤用。

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.

since的四種用法

1） since +過去一個時間點（如具體的年、月、日期、鐘點、1980, last month, half past six）。例如：I have been here since 1989. 1989起，我一直在這兒。

2） since +一段時間+ ago。例如：I have been here since five months ago. 我在這兒，已經有五個月了。

3） since +從句。例如：Great changes have taken place since you left. 你走后，變化可大了。 Great changes have taken place since we were here. 我們走后，變化可大了。

4） It is +一段時間+ since從句。例如：It is two years since I became a postgraduate student. 我考上研究生有兩年了。

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