nothing nobody no one everything everybody everyone anything anybody anyone something somebody someone等词属于不定代词用法有四：
1.作主语时当第三人称单数使用.
2.有形容词修饰时,形容词放在后面.
3.nothing everything something anything 在反义疑问句中的主语为it.
nobody everybody anything somebody 在反义疑问句中的主语为they.
4.nothing no one nobody表否定,在反义疑问句中的简短问句要用肯定.