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六年級(jí)英語語法-比較since和for

來源:學(xué)大教育     時(shí)間:2016-01-26     

六年級(jí)英語語法-比較since和for

Since 用來說明動(dòng)作起始時(shí)間,for用來說明動(dòng)作延續(xù)時(shí)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 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 作為時(shí)間狀語的句子都用現(xiàn)在完成時(shí)。

I worked here for more than twenty years.

(我現(xiàn)在已不在這里工作。)

I have worked here for many years.

(現(xiàn)在我仍在這里工作。)

小竅門: 當(dāng)現(xiàn)在完成時(shí)+一段時(shí)間,這一結(jié)構(gòu)中,我們用下面的公式轉(zhuǎn)化,很容易就能排除非延續(xù)動(dòng)詞在完成時(shí)中的誤使。

1) (對(duì)) Tom has studied Russian for three years.

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

2) (錯(cuò)) 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(duì),它應(yīng)改為 Harry got married six years ago. 或 Harry has been married for six years.

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