American English Phonetics

13.5 Palatalization

Alveolar stops /t,d/ + Palatal approximant /j/ in a weak syllable become palatoalveolar affricates /t͡ʃ,d͡ʒ/.This kind of assimilation, in which a single new sound arises from the combination of two sounds, is called coalescent assimilation: don’t you(r), can’t you(r), did you(r), would you, situation, educate.