a、人称代词I作主语。由于“am+not”无缩写形式,所以后面问句的谓语和陈述句的谓语不一致
b、指示代词this 或that;these或those 作陈述句的主语, 其简短的主语分别为it 或they。
c、不定代词:everyone, everybody , anyone, anybody, someone,somebody, no one, nobody,问句部分的主语用they
d、不定代词 everything , nothing , anything , something 做主语时,其问句部分的主语用it .