分析：主语：Americans；谓语：say；that引导一个宾语从句，还包含有一个省略了关联代词的定语从句，a person can be sure in life修饰two things. 当先行词在定语从句中作宾语时，常可省略。
Americans often say that there are only two things a person can be sure of in life: death and taxes.(*)
用于人的量词，带有尊敬的色彩。常和指示代词或数词结合，在句子中作主语、定语或宾语。例如。
It is a measure word used respectfully for persons. Precededby a demonstrative pronoun or numeral, it can be used as the subject, attributive or object of a sentence, e. g.
关系代词和关系副词引导定语从句。
Relative pronouns and adverbs introduce attributive clauses.
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