1.过去式用于一般过去时的谓语;He cleaned the room yesterday.(cleaned过去式作谓语动词)
2.过去分词,现在分词是非谓语形式,必须借助助动词构成谓语,例如:
(1)have/has+过去分词构成现在完成时,He has cleaed the room..(cleaned过去分词和助动词has构成谓语)
(2)am is are was were等+过去分词构成被动语态,The room was cleaed by her.(cleaned过去分词和助动词was构成谓语,表示被动。)
3.过去分词,现在分词是非谓语形式,在句子中直接用作非谓语,作谓语除外的成分,
例如:a moving story(动人的故事);a moved boy(一位受感动的孩子)。这里都是过去分词,现在分词作定语,相当于形容词。
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