title: Can i express someone must-do(modal verb) something with semantic web?
body: <p><a href="https://en.wikipedia.org/wiki/Modal_verb" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Modal_verb</a></p>
  
  <p>whatever its in any form of rdf rdfs owl shacl etc...</p>
  
  <p>someone do something vs someone "must"-do something</p>
  
  <p>Sam go to school. Sam "must" go to school.</p>
  
  <p>and another case is someone must do, but do what is not important.</p>
  
  <p>?s ?p
  ?subject:Sam ?predict:shouldWork</p>