These commonly-used auxiliaries (and copulas) indicate that the speaker has serious doubts about what he or she is asserting. These three auxiliaries consist of the interrogative particle ཨ་ (or ཨེ་ in Literary Tibetan) and the copulas ཡོད་, ཡིན་, or ཡོང་.

• ཐག་ཉེ་སར་འབྲོག་པ་ཨ་ཡོད། “I doubt that there are nomads near here.”
• ཇ་སྐོལ་ལོང་ད་ཨ་ཡོང་། “I doubt if there’ll be time to make tea.”
• ཨེམ་ཆི་ཅིག་རག་ཨ་ཡོང་། “I doubt that we’ll find a doctor.”