英语中的名词可以用作句子中的主语、宾语以及表语。
主语:名词有专有名词和普通名词,专有名词在做主语须在名词前加上the,普通名词做主语时需要加上限定词或者为复数形式。做主语时,第一个字母需要大写。例如:Apples are very big and sweet.
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宾语:宾语一般是在动词之后,做动词的补充,及宾语。例如:I like to play the basketball.
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表语:表语一般是在系动词之后,系动词有am/is/are。例如:They are my friends.