does 用在一般现在时一般表示（做）,也是助动词,就是出现了does的动词+原型.
如：Does she do her homework yesterday?
I am better now but I mustn't get up yet 改成 Jimmy is better now but he mustn't get up yet.
这里的am 和is对应,和does没关系；must语气最强烈,任何时候不用改
如果你一定要用一般现在时,也是可以的,前句改成Jimmy gets better now. 问句就是does Jimmy get better now?
do一般出现的时候没有实质意义要是后面加does就变成：Jimmy做好了,但他还不起床