8.130 past participle

You use 'having' and a past participle to mention something which happened before the thing described in the main clause.

• About twice a month, enough evidence having accumulated, the police would feel obliged to stage a raid.
• The Border having become more settled, they had selected a site near the Kalpani River.
• George having been carried to his cabin, Ash had gone up to the deserted deck.
• The subject having been opened, he had to go on with it.

You use a past participle on its own to say that something was done or completed before the event or situation described in the main clause.

• He proceeded to light his pipe. That done, he put on his woollen scarf and went out.