变换句子的开头结构的方法：

　　名词做主语

　　介词短语作状语

　　副词作状语

　　状语从句

　　分词短语作状语

　　形容词短语作状语

　　主语从句

　　不定式短语做主语或状语

　　动名词做主语

　　实例：

　　To begin with, even in such areas as computer science, where it is estimated that much of what a student learns today will be obsolete in just five years, an advanced degree and the education it represents will continue to be of benefit. Unlike undergraduate education, which is divided into a number of small educational units every term, post-baccalaureate education is concentrated on deeper learning in fewer areas. Moreover, most graduate education requires extended, critical focus on complex issues or research projects. And even if the technical information relevant to completing a graduate-level project becomes outmoded, the learned critical methods and problem-solving approaches will not.

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