By American English, Modal verbs

Can he be working at this time? No, he can't. Can he be working at this time? Yes, he __. Which modal verb should I use to fill in the blank?

Re: The tenseless modals verbs of English Posted: 13/02/2005 09:52 PM JTT wrote: Every modal verb in English can operate in past, present and future situations. Modals carry modal meaning into sentences, they do not carry tense. "operate", yes. I agree. Both statements are true. I trust...