谓语：动词（助动词,be动词...)
表语：形容词,名词
宾语：名词（代名词,普通名词...)
暂时可以这么了解,多看看句子,领悟领悟,再深入理解谓语可以由什么组成复合谓语?1.助动词/ 情态动词 + 实义动词原形 eg: I do believe I can. I should go home for my homework.
2.be动词 +形容词 + to / of / for。。。+动词原形 / 名词或动词现在分式 eg：You are able to do it. The book issuitable for students studing. Nowadays students are short of exercise.
3.系动词 + 形容词eg: He looks pale, so I feel worryed.
简单来说就是这些，要多结合书本上的例子，更容易记住。