have的過去式是什麼

例句：

They had had their pet dog stuffed.

他們請人把他們的寵物狗製成了標本。

She had repented of what she had done.

她對自己所做的事深感懊悔。

Everything had gone.

一切都過去了。

The car had had it.

這輛車無法修復了。