Slovo “shell” je zastarale a prestava se pouzivat. Nemusi to byt pravda ( ja se ucim americkou anglinu). Na techto strankach je velice dobre vysvetlena cela gramatika http://owl.english.purdue.edu/…urce/601/01/
Slovo “supposed " Ja myslim ze to ma znit takto: I was supposed to call today. ( mela jsem dnes zavolat) I am suppose to call today. ( zmeneny cas / ja mam dnes zavolat) "be supposed to” video v anglictine zde : http://www.engvid.com/…supposed-to/
“I am suppose to call today” to asi taky nebude, vidte?