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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：Computers are now being widely used in almost all fields. 2代词：We are now living in an information-explosion era. 3主语从句：Whether sports stars should earn a high salary is still discussed heatedly. 4V-ing: Surfing the Internet offers a new way for people to relax themselves. 5To do: To protect the environment is 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 stars earning a high salary is unfair and unjustified. 2表动作用及物或不及物动词：The Internet has revolutionized peoples way of life. Taste differs. 3表拥有：人或物时用：have has 无生命的东西：there be People have different views on this question. There is no absolute agreement on this question. | 
