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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 everybody’s 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 salaryisunfair and unjustified.
2表动作用及物或不及物动词：The Internethas revolutionizedpeople’s 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.
三、宾语：及物动词或介词所指向的对象。在写作中常做宾语的有名词、宾语从句、复合结构、V-ing、To do五种。