In general passive with -s describes an abstract proces - time and place unregarded - whereas passive with blive describes an event in time and place: "happen that...". The modal verbs all have more than one meaning and tend to have one meaning in combination with -s passive and another in combination with blive passive. The exercises forcus on some of the more common meanings, but do not cover all.

Kan....-s describes an innate capacity or quality Jakken kan tumbles tør. (The jacket may be tumbled dry.)

Kan blive describes an occasion: Jakken kan blive tumblet tør, når vi kommer hjem. (The jacket may be tumbled dry when we get home)

Choose the right combination in the drop-down list

Kom nu, der er fodbold! Bilen kan blive vasketvaskes en anden dag.

Tror du min body-builder-silke-T-shirt kan blive vasketvaskes i maskinen?