have has過(guò)去式和過(guò)去分詞都是：had；
例句：
They had had their pet dog stuffed.
他們請(qǐng)人把他們的寵物狗制成了標(biāo)本。
She had repented of what she had done.
她對(duì)自己所做的事深感懊悔。