句子構成的成分共分爲九種：主語，謂語，賓語，表語，定語，狀語，補語，同位語和插入語。本文將爲大家介紹主語，謂語，賓語三種語法。
一、主語：句子的'核心主體，通常位於謂語動詞之前，表明一個句子是誰或何種情況所發出執行或是承受的。在雅思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：Computers are now being widely used in almost all fields.
2代詞：We are now living in an information-explosion era.
3主語從句：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、謂語：描述或闡述主語的情況，由動詞來充當，常位於主語之後。
1表狀態用系動詞：As I see it, movie stars earning a high salary is unfair and unjustified.
2表動作用及物或不及物動詞：The Internet has revolutionized peoples way of life. Taste differs.
3表擁有：人或物時用：have has 無生命的東西：there be
People have different views on this question.
There is no absolute agreement on this question.
