have的过去式和过去分词是什么？

She'll have had the results by now.

她现在应该知道结果了。

We had a day out in the country.

我们在乡下玩了一天。

He had to go to the hospital for treatment.

他不得不去医院接受治疗。

Had I known that I would never have come.

要是早知道，我绝不会来的。

He had to go to hospital for treatment.

他不得不去医院接受治疗。