句子成分主语（subject）: 句子说明的人或事物。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） To see is to believe. （不定式） What he needs is a book. （主语从句）It is very clear that the elephant is round and tall like a tree. （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。We study English. He is asleep. 表语（predicative）: 系动词之后的成分，表示主语的性质、状态和特征。 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. Now I feel tired.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） Did you write down what he said? （宾语从句） 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.宾补：对宾语的补充，全称为宾语补足语。We elected him monitor. （名词）We all think it a pity that...
