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代词分为九类：人称代词、物主代词、反身代词、相互代词、指示代词、疑问代词、连接代词、关系代词、不定代词。大多数代词具有名词和形容词的作用。 1．人称代词 (1)人称代词作主语用主格，作宾语、表语用宾格，但应注意以下四种情况： ①作主语的人称代词如果孤立地使用于无谓语动词的句子中，或在这种句子中与动词不定式连用，常用宾格。 —Susan，go and join your sister cleaning the yard. —Why me？John is sitting there doing nothing. ②句子中代词作宾语或宾语补足语时，与所替代的名词在人称、数、格以及意义上一般要保持前后一致。 The thief was thought to be he.(the thief是主格，故用he替代) They took me to be her.他们误以为我是她。(me是宾格，故用her替代) ③作表语的人称代词一般用宾格，但在强调句型中，被强调部分代词的格不变。 I met her in the hospital.→It was her who I met in the hospital. ④在比较级的句子中than、as后用主格、宾格都可以。如：He is taller than me (I)．但在下列句子中有区别： I like Jack as much as her.＝I like both Jack and her. I like Jack as much as she.＝I like Jack and she likes him，too. | 
