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Active: having * past participle
The drillers opened up the well. Then they installed some casing. +
Having opened up the well, the drillers installed some casing. (This has the
same meaning as: After opening up the well, the drillers installed some casing.)
Passive: having + been + past participle
The water is pumped up to the storage tank. Then it flows down to the
irrigation channel. - Having been pumped up to the storage tank, the water
flows down to the irrigation channel. (This has the same meaning as: After
being pumped up to the storage tank, the water flows down to the irrigation
channel.)
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