句子成分主语(subject):句子说明的人或事物
Thesunrisesintheeast
(名词)Helikesdancing
(代词)Twentyyearsisashorttimeinhistory
(数词)Seeingisbelieving
(动名词)Toseeistobelieve
(不定式)Whatheneedsisabook
(主语从句)Itisveryclearthattheelephantisroundandtalllikeatree
(It形式主语,主语从句是真正主语)谓语(predicate):说明主语的动作、状态和特征
WestudyEnglish
Heisasleep
表语(predicative):系动词之后的成分,表示主语的性质、状态和特征
Heisateacher
(名词)Seventy-four
Youdon’tlookit
(代词)Fiveandfiveisten
(数词)Heisasleep
(形容词)Hisfatherisin
(副词)Thepictureisonthewall
(介词短语)Mywatchisgone/missing/lost
(形容词化的分词)Towearafloweristosay“I’mpoor,Ican’tbuyaring
(不定式)Thequestioniswhethertheywillcome
(表语从句)(常见的系动词有:be,sound(听起来),look(看起来),feel(摸起来,smell(闻起来),taste(尝、吃起来),remain(保持,仍是),feel(感觉)
Itsoundsagoodidea
Thesoundsoundsstrange
Hervoicesoundssweet
Tomlooksthin
Thefoodsmellsdelicious
Thefoodtastesgood