一、主语（subject）: 句子说明的人或事物。它是一句话的中心，整句话都是在谈它的情况（是什么）
The sun rises in the east. (名词)
He likes dancing. (代词)
Twenty years is a short time in history. (数词)
Seeing is believing. (动名词)
二、谓语（predicate）:是主语的主要情况，说明主语的动作、状态和特征。（主语要干什么）
We study English.
He is asleep.
三、宾语：
1)动作的承受者——动宾
I like China. (名词)
He hates you. (代词)
How many do you need? We need two. (数词)
We should help the old and the poor.
I enjoy working with you. (动名词)
I hope to see you again. (不定式)
2)介词后的名词、代词和动名词——介宾
Are you afraid of the snake?
Under the snow, there are many rocks.
3) 双宾语——间宾(指人)和直宾(指物)
He gave me a book yesterday.
Give the poor man some money.
四、表语（predicative）:系动词之后的成分，表示主语的性质、状态和特征。和系动词一道构成谓语。
He is a teacher. (名词)
Seventy-four! You don’t look it. (代词)
Five and five is ten. (数词)
He is asleep. (形容词)
His father is in. (副词)
The picture is on the wall. (介词短语)
My watch is gone / missing / lost. (形容词化的分词)
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) ….
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.
五、定语：修饰或限制名词或代词的词、词组或句子。
Ai Yanling is a chemistry teacher.(名词)
He is our friend. (代词)
We belong to the third world. (数词)
He was advised to teach the lazy boy a lesson.(形容词)
The man over there is my old friend.(副词)
The woman with a baby in her arms is my sister. (介词)
The boys playing football are in Cla2. (现在分词)
The trees planted last year are growing well now. (过去分词)
I have an idea to do it well. (不定式)
六、状语：用来修饰v., adj., adv., or 句子。 表示时间、地点、原因、目的、结果、程度、条件、方式和让步。
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.
七、同位语：
