不定代詞one及一系列變形的用法

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不定代詞有許多,最不好掌握的是one及其一系列變形,如:oneself(反身代詞),ones(復(fù)數(shù)),one's(所有格)。其用法為:
    1) one修飾名詞時,強調(diào)數(shù)量“一個”,a和an只表示單數(shù)形式。
    【例如】
    One dish is not enough. I need at least two.
    An apple looks different from a pear.
    2) one常用來表示某一個人,有時可以用he或she來代替。
    【例如】
    One is usually over sensitive about one's own family when he is out.
    3) ones是one的復(fù)數(shù),前面可以用定冠詞和指示代詞修飾。oneself為反身
    代詞,one's為所有格形式。
    【例如】
    One mustn't take oneself too seriously.
    These ones are better than those ones.