I would like to ask this question:
Is it correct to say "until someone can (do something)"? I understand that the common form is "until someone (does something)". E.g. "there is nothing I can do until someone can come here" or "there is nothing I can do until someone comes here".
Also, is "until someone will (do something)" acceptable? i.e. is it acceptable to use modals with until?
Thank you in advance. English is my second language, so I often make the mistake of using unidiomatic expressions.