，与一般过去时连用。
时间的以前，通常与过去完成时连用；或泛指以前，并不具体指若Their decision five years ago to computerise the company is now paying dividends.
五年前他们作出的使
脑化的决定现在正产生出效益。
Their decision five years ago to computerise the company is now paying dividends.
五年前他们作出的使脑化的决定现在正产生出效益。
Their decision five years ago to computerize the company is now paying dividends.
五年前他们做出使脑化的决定现在正产生出效益。
His advancement to major came two years ago.
他于两年前被提升为少校。
Several years ago, Pauline made a crablike robot that would scurry across the floor.
几年前，波林做了一个会在地板上疾爬的蟹形机器生物。
The term “meta directory” came into industry parlance two years ago.
两年前，商业界开始用“元目录”这个术语。
I have a very sharp recollection of my last talk with him two years ago.
两年前我和他最
一次谈话的情景仍历历在目。
A hundred years ago people scoffed at the idea.
一百年前人们曾嘲笑过这种想法。
This big shop is an outgrowth of my little shop I started three years ago.
这所大商店是由我三年前开办的那个小店铺发展而成的。
She became a strict vegetarian two years ago.
两年前她成为严格的素食主义者。
The pair of lions which were found five years ago were metallic.
这对五年前发现的狮子是金属制的。
He is paralyzed as the result of a would-be assassin's bullet years ago.
几年前有人对他行刺未遂, 但子弹使他瘫痪了。
Ten years ago, they began to develop the aviation (industry).
十年前, 他们开始发展航空工业。
There was a light breeze a moment ago.
片刻前有一阵微风。
A year ago he had a blood clot removed from his brain.
他脑内的血块一年前被取出了。
They captured this place two days ago.
他们两天前占领了这个地方。
Many thousand years ago people learned how to domesticate animals.
数千年以前人们就学会了饲养动物。
Food rationing was abolished in that country long ago.
那个国家早就取消了粮食配给制。
It was clear months ago that the firm was on the skids.
这家几个月以前就有明显的衰败迹象。
Half a century ago it's difficult to conceive of travelling to the moon.
半个世纪前去月球旅行是难以想象的。
How long ago is it that you last saw her?
你上次看见她是多久以前?
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