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句子構(gòu)成的成分共分為九種：主語，謂語，賓語，表語，定語，狀語，補語，同位語和插入語。
一、主語：句子的核心主體，通常位于謂語動詞之前，表明一個句子是誰或何種情況所發(fā)出執(zhí)行或是承受的。在寫作中常做主語的有名詞、代詞、主語從句、V-ing、To do五種。
1名詞：Computersare now being widely used in almost all fields.
2代詞：Weare now living in an information-explosion era.
3主語從句：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、謂語：描述或闡述主語的情況，由動詞來充當，常位于主語之后。
1表狀態(tài)用系動詞：As I see it, movie stars’earning a high salaryisunfair and unjustified.
2表動作用及物或不及物動詞：The Internethas revolutionizedpeople’s way of life. Tastediffers.
3表擁有：人或物時用：have has無生命的東西：there be
Peoplehavedifferent views on this question.
There isno absolute agreement on this question.
4情態(tài)動詞+動詞原形：
In this way, teacherscan never be replacedby computers.
三、賓語：及物動詞或介詞所指向的對象。在寫作中常做賓語的有名詞、賓語從句、復合結(jié)構(gòu)、V-ing、To do五種。