从形式上讲，包括名词主语、代词主语、小句作主语等等。
In the form, it includes subject noun, subject pronoun, subject clause and so on.
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，apersoncanbe sureinlife修饰twothings. 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.
确定不定式逻辑主语的主要方法是确定句中哪一个名词或代词与不定式逻辑上有主谓关系。
One desirable way is to ascertain which noun or pronoun is logically related to the infinitive phrase and ACTS as its logical subject.
不定代词作主语，总与动词的单数形式搭配。
When an indefinite pronoun is the subject, it always takes a singular verb.
网上英语聊天者可以省略冠词、主语、代词等等。
In English, instant messengers can leave out articles, subjects, pronouns, etc.
摘要：法语代词式动词在变位中过去分词同主语的性数配合始终是困扰初学者的一个难题。
Abstract: the French pronouns verb in a past participle in agree with its subject in number with is always plagued by a problem beginners.
当宾语与句子的主语是同一人或事，反身代词可作直接或间接宾语。
You use reflexive pronouns after nouns or pronouns to emphasize the person or thing that you are referring to.
当宾语与句子的主语是同一人或事，反身代词可作直接或间接宾语。
You use reflexive pronouns after nouns or pronouns to emphasize the person or thing that you are referring to.
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