DI-2

('di' in the second tone)

Some 64 standard Chinese characters have a 'di' pronunciation. Common sound-defining components of more complicated characters are: 氐 (11 occurences), 帝 (11),  弟 (7)

的确 = di(2)que(4) = really, indeed

的确对不起 = di(2)que(4) dui(4)bu(-)qi(3) = really sorry