have的过去式和过去分词都是had。
had：
v.有;持有;占有;由…组成;显示出(性质、特征)。
aux.had 有时代替 if 用于从句句首，表示某种情况可能发生但并未发生。
have的过去分词和过去式。
扩展资料
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。
Ive had to put my plans into cold storage.
我不得不把我的计划暂时搁置起来。
I had a long conversation with her the other day.
前几天我与她作了一次长谈。
