小學六年級英語語法
Since用來說明動作起始時間，for用來說明動作延續(xù)時間長度。
Ihavelivedhereformorethantwentyyears.
IhavelivedheresinceIwasborn..
Myaunthasworkedinaclinicsince1949.
Somenewoilfieldshavebeenopenedupsince1976.
IhaveknownXiaoLisinceshewasalittlegirl.
MybrotherhasbeenintheYouthLeaguefortwoyears.
Ihavenotheardfrommyuncleforalongtime.
注意：并非有for作為時間狀語的句子都用現(xiàn)在完成時。
Iworkedhereformorethantwentyyears.
(我現(xiàn)在已不在這里工作。)
Ihaveworkedhereformanyyears.
(現(xiàn)在我仍在這里工作。)
小竅門： 當現(xiàn)在完成時+一段時間，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)動詞在完成時中的誤使。
1) (對)TomhasstudiedRussianforthreeyears.
=TombegantostudyRussianthreeyearsago,andisstillstudyingitnow.
2) (錯)Harryhasgotmarriedforsixyears.
=Harrybegantogetmarriedsixyearsago,andisstillgettingmarriednow.
顯然，第二句不對，它應(yīng)改為Harrygotmarriedsixyearsago. 或Harryhasbeenmarriedforsixyears.
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