我看见一个老人正在外面修剪他的树篱。

I saw an old man out clipping his hedge.

《柯林斯英汉双解大词典》

当我在最后一个十字路口等绿灯时，我看见一个老人朝我走来。

At the last crossing, while I was waiting for the green light, I saw an old man walking toward me.

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就在那时，我看见一个老人正在过马路。

Just at that time, I saw an old woman crossing the street.

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