在I can't drive一句中，可推测出宾语a car被省略了。
In the sentence 'I can't drive', the object 'a car' is understood.
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.(*)
主、宾语位置上的定语在句中可以后移至主语后直接作谓语或移至句尾作分句中省略主语的谓语。
The attribute modifying subject or object can be moved after subject as predicate or to the end of the sentence as predicate missing subject.
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