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句子构成的成分共分为九种：主语，谓语，宾语，表语，定语，状语，补语，同位语和插入语。 一、主语：句子的核心主体，通常位于谓语动词之前，表明一个句子是谁或何种情况所发出执行或是承受的。在写作中常做主语的有名词、代词、主语从句、V-ing、To do五种。 1名词：Computersare now being widely used in almost all fields. 2代词：Weare now living in an information-explosion era. 3主语从句：Whether sports stars should earn a high salaryis still discussed heatedly. 4V-ing:Surfing the Internetoffers a new way for people to relax themselves. 5To do:To protect the environmentis everybodys business. 二、谓语：描述或阐述主语的情况，由动词来充当，常位于主语之后。 1表状态用系动词：As I see it, movie starsearning a high salaryisunfair and unjustified. 2表动作用及物或不及物动词：The Internethas revolutionizedpeoples way of life. Tastediffers. 3表拥有：人或物时用：have has无生命的东西：there be Peoplehavedifferent views on this question. There isno absolute agreement on this question. 4情态动词+动词原形： In this way, teacherscan never be replacedby computers. | 
