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
