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。
