So I know for certain words, such as 不对
, the fourth tone changes, but I believe 不 may be a special case.
Some words such as 部队 seem uncomfortable to pronounce if I strictly follow 4th and 4th tones, but saying words such as 汉字, don't feel as uncomfortable.
Is there a general rule (or at least a general rule with a few exceptions), for pronouncing double fourth tone words?