Avoid the oo as in   pronounced ; thus it is pronounced stewpid or commonly schewpid, not stoopid, etc. duty would be pronounced dewty or more often jooty. In the standard English accent, the A (for example, in father) is pronounced at the back of the mouth with an open throat—it sounds like "arh". This is the case in pretty much all British accents, but it's exaggerated in RP. In southern England and in RP, words such as "bath", "path", "glass", "grass" also use this vowel (barth, parth, glarss, grarss, etc.). However, in other parts of Britain "bath", "path", etc. sound like "ah".
يُنطَق حرف U في كلمة stupid و duty بالصوت ew أو "you".