过去式：用于一般过去时，做谓语。例：She went to school yesterday.过去分词：1). 用于完成时，与have和had分别构成现在完成（进行 时和过去完成（进行）时，做谓语。例：She has gone to school.2). 与be构成被动语态。例：He is beaten by his father.3). 非谓语动词之一，表示被动，完成的意思，可作定语，表语，补语和状语。例：The boy beaten by his father is my friend.
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