助动词,谓语动词助动词能做谓语动词么?比如 have,is ,was.After he had finished his

助动词,谓语动词助动词能做谓语动词么?比如 have,is ,was.After he had finished his He is singing.is 做助动词协助主要动词singing 做谓语? 助动词和实义动词能做谓语 am is are was were +doing这里的am is are was were am is are was were作为助动词时,后面的谓语动词还是原型吗. 助动词和实义动词能做谓语 be doing可以做谓语这里的doing是实义动词吗 不是非谓语动词吗 英语中助动词是不是谓语动词 助动词和实义动词能做谓语 be doing这里的doing是实义动词吗 Doing sperts makes us he have属于什么动词?谓语动词?助动词?请解释一下谓语动词和助动词以及实义动词的用法和什么意思 副词用法当句子谓语用助动词+实义动词,副词可以放在助动词和实义动词之间?例如：A) He is happily sing 谓语动词 系动词是不是都是助动词的一部分? 英语中可以做谓语动词的有哪些词?系动词,助动词,情态动词,be动词, be动词 能做连系动词和助动词,但有be动词存在的句子,我不知道到底哪个是谓语