have的过去式： had，过去分词： had；havevt有;持有;占有;由…组成;显示出，带有(性质、特征)；aux.与过去分词连用构成完成时

相关介绍：

I had some idea of what the job would be like.

我对于这份工作有了一些了解。

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。