I cannot find any resources online for tag question with the phrase 'used to be'. I'm looking for something that can give the rules for this example, "He used to be handsome, didn't/wasn't he? Thanks ...
How often can you hear an educated native speaker say She can't have done that, can she? She can have done that, can't she? She mustn't have done that, must she? She must have done that, mustn't she?...