如果是动词短语,那么就是整体作谓语;如果是单独动词,那么就是动词充当谓语成分.
在英语中,非情态动词之外的动词都可以单独作谓语;而情态动词必须与其他非情态动词一起连用共同构成谓语,称为复合谓语.
例如:
I am a student (系动词am作谓语)
He played tennis yesterday.(实义动词play作谓语)
She can dance(情态动词can和实义动词dance共同构成复合谓语)
She looks after her father.(实意动词look和介词after共同构成谓语)