翻译是does he ill?还是is he ill?为什么?

翻译是does he ill?还是is he ill?为什么? He feels ill 改一般疑问句改成Does he feel ill?为何用does不用Is? because he is ill He is serioudly ill. He is ill ＿ now he is ill He is ill对ill提问 He looks as if he is ill为什么用if 、 I guess he is ill. Today he is still___.(ill) He is ill in h_____ He is seriously ill.为什么serious要用副词哪,这里的ill是什么词性哪.