he is singing里的is是助动词吗?如果是,那么真正的动词在哪?

Is he singing 的否定回答怎么说? he is singing里的is是助动词吗?如果是,那么真正的动词在哪? He is not good at singing.划singing 划线提问 He is good at singing 改成感叹句He is good at singing改成________ ________he sings! I heard he is singing.是病句么?能不能改为I heard that he is singing. He Can Alway Bring Pleasure To His Audience While Singing.为什么是While Singing而不是While He Is Singing 求确切的解释, Do you find he is singing in the room的同义句是什么?急用! He is good at singing的同义句只有三个空！ singing he a is song lovely 连词成句 his is he song favouurite singing 连词成句 He is good at singing and dancing 同义句两个 He is singing 这句话有表语吗? He is good at singing and dancing 同义句两个 He is singing a song to your mother.是什么意思? 英语翻译他在低声唱歌He is singing in a [ ][] my brother can () very well.He is () now.A.sing,singing B.singing,sing csing,sings the boy is singing Jane is good( )singing.(