回答如下：

英语谓语有简单谓语和复合谓语两类，能够作谓语的有实义动词和动词短语。英语的助动词、情态动词、系动词、不定式、动名词和分词都不能单独作谓语，只能跟后面的其他成分一起构成复合谓语。例如：

He works hard. He bought a cap. We love him.

He is ill / tall / out / in the room / a doctor / badly injured.

We don't know her. He did go there yesterday. He can swim. She is working. We have been there. He has gone swimming. The book is interesting. My job is cleaning / to clean the room. The answer is for you to answer. The fact is that he gave up the job.