have的过去分词 have英[h？v]美[h？v]aux.用以构成完成式2113及完成式的不定式5261，表示已经…vt.有4102，具有；拿，取得；从事；必须1653，不得不n.〈口〉有产者，有钱人；富国；〈英俚〉欺骗，诈骗第三人称单数：has现在分词：having过去式：had过去分词：had
have的过去分词是had还是haved 21.7 情态动词 have 过去分词 分类：英语学习1)may(might)have done sth，can(could)have done sth 表示过去，推测过去时间里可能发生的事情.Philip may(might)have been hurt seriously in the car accident.Philip can(could)have been hurt seriously in the car accident.2)must have done sth，对过去时间里可能发生的事情的推测，语气较强，具有\"肯定\"，\"谅必\"的意思.Linda has gone to work，but her bicycle is still here.She must have gone by bus.3)ought to have done sth，should have done sth本应该做某事，而事实上并没有做.否定句表示\"不该做某事而做了\".You ought to(should)have been careful in this experiment.He ought not to have thrown the old clothes away.（事实上已扔了.）ought to 在语气上比should 要强.4)needn't have done sth 本没必要做某事I dressed very warmly for the trip，but I needn't have done so.The weather was hot.5)would like to have done sth 本打算做某事I would like to have read the article，but I was very busy then.21.8 should 和ought toshould 和ought to 都为\"应该\"的意思，可用于各种人称。.
英语中什么时候用have been+过去分词什么时候用have +过去分词 have been+过去分词和have+过去分词都是构成现在完成时.但是have been+过去分词是现在完成时的被动语态，而have+过去分词则是主动形式.如果你对现在完成时没有问题的话，这两个形式的区分就主要看是否是需要被动还是主动语态了.
