一、主語(subject): 是一句的主體，是全句述說的對象，常用名詞，數詞或代詞擔任，一般放於句首。句子說明的人或事物。
The sun rises in the east. (名詞)
He likes dancing. (代詞)
Twenty years is a short time in history. (數詞)
Seeing is believing. (動名詞)
To see is to believe. (不定式)
What he needs is a book. (主語從句)
It is very clear that the elephant is round and tall like a tree.
(It形式主語，主語從句是真正主語)
二、謂語(predicate):是對主語加以陳述，表示主語的行爲或狀態，常用動詞或者動詞詞組擔任，放在主語的後面。說明主語的動作、狀態和特徵。
We study English.
He is asleep.
三、表語(predicative):表示行爲的對象，常由名詞或者代詞擔任。放在及物動詞或者介詞之後。系動詞之後的.成分，表示主語的性質、狀態和特徵。
He is a teacher. (名詞)
Seventy-four! You don’t look it. (代詞)
Five and five is ten. (數詞)
He is asleep. (形容詞)
His father is in. (副詞)
The picture is on the wall. (介詞短語)
My watch is gone / missing / lost. (形容詞化的分詞)
To wear a flower is to say “I’m poor, I can’t buy a ring. ” (不定式)
The question is whether they will come. (表語從句)
常見的系動詞有: be, sound(聽起來)， look(看起來)， feel(摸起來)，smell(聞起來)，
taste(嘗、吃起來)， remain(保持，仍是)， feel(感覺) ….
It sounds a good idea.
The sound sounds strange.
Her voice sounds sweet.
Tom looks thin.
The food smells delicious.
The food tastes good.
The door remains open.
Now I feel tired.
三、賓語：
1)動作的承受者——動賓
I like China. (名詞)
He hates you. (代詞)
How many do you need? We need two. (數詞)
We should help the old and the poor.
I enjoy working with you. (動名詞)
I hope to see you again. (不定式)
Did you write down what he said? (賓語從句)
2)介詞後的名詞、代詞和動名詞——介賓
Are you afraid of the snake?
Under the snow, there are many rocks.
3) 雙賓語——間賓(指人)和直賓(指物)
He gave me a book yesterday.
Give the poor man some money.
四、賓補：對賓語的補充，全稱爲賓語補足語。
We elected him monitor. (名詞)
We all think it a pity that she didn’t come here. (名)
We will make them happy. (形容詞)
We found nobody in. (副詞)
Please make yourself at home. (介詞短語)
Don’t let him do that. (省to不定式)
His father advised him to teach the lazy boy a lesson. (帶to不定式)
Don’t keep the lights burning. (現在分詞)
I’ll have my bike repaired. (過去分詞)
五、主補：對主語的補充。
He was elected monitor.
She was found singing in the next room.
He was advised to teach the lazy boy a lesson.
六、定語：修飾或限制名詞或代詞的詞、詞組或句子。
Ai Yanling is a chemistry teacher.(名詞)
He is our friend. (代詞)
We belong to the third world. (數詞)
He was advised to teach the lazy boy a lesson.(形容詞)
The man over there is my old friend.(副詞)
The woman with a baby in her arms is my sister. (介詞)
The boys playing football are in Cla2. (現在分詞)
The trees planted last year are growing well now. (過去分詞)
I have an idea to do it well. ()
You should do everything that I do. (定語從句)
七、狀語：狀語是用來說明動詞，形容詞，副詞或整個句子的成分。常由副詞擔任。修飾動詞時可以放在動詞之前，也可以放在動詞之後;修飾形容詞或副詞時放在它們之前。
(以下例句按上述順序排列) I will go there tomorrow.
The meeting will be held in the meetingroom.
The meat went bad because of the hot weather.
He studies hard to learn English well.
He didn’t study hard so that he failed in the exam.
I like some of you very much.
If you study hard, you will pathe exam.
He goes to school by bike.
Though he is young, he can do it well.
