have的过去式是什么

　　例句：

　　They had had their pet dog stuffed.

　　他们请人把他们的宠物狗制成了标本。

　　She had repented of what she had done.

　　她对自己所做的事深感懊悔。

　　Everything had gone.

　　一切都过去了。

　　The car had had it.

　　这辆车无法修复了。