It is raining.中的谓语是“is”还是“raining”还是“is raining”?

It is raining.中的谓语是“is”还是“raining”还是“is raining”? It is very raining it is raining是什么意思? It is raining (heavy). It is raining there.对“raining"提问 It is raining now.raining 词性是什么 现在分词是非谓语,那在it is raining heavily,中是 is+raining 构成的复合谓语? it is raining heavily,是不是主系表结构,还是主语+不及物动词 is后面加rainy还是raining it is raining的歌词 It is raining now.It_____yesterday. it is raining,as usual