Modals – Obligation On April 29, 2012 / In Grammar 66 Views How to use the modal of obligation – “Be supposed to”.For More Modals Videos and Activities – Click HereRelated posts:YouTube English Class Lesson - Unreal Conditionals - Past: Huvr BoardMovie Trailer ESL Activity - Man of Steel (Superman)Adjective Clauses - Common Mistakes #2 modal forms, modals Post navigation Prev PostBest iPad Apps for ESL Teachers #8 – AppsGoneFree Next PostModals – Advisability / Present