不定代词;
When an indefinite pronoun is the subject, it always takes a singular verb.
不定代词作主语, 总与动词的单数形式搭配.
" It " is an indefinite pronoun . " it "
是个不定 代名词.
A and an are indefinite articles, any is an indefinite pronoun.
a和an是不定冠词, any是不定代词.
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