The correct spelling of "had seat" is /hæd sit/. The "h" sound is followed by the short "a" vowel sound represented by "a" in "had." The "d" sound is followed by the "s" sound represented by "s" in "seat." The final "t" sound is also represented by "t" in "seat." Remembering the correct spelling of words may take time and practice, but it is important to ensure effective communication and clear understanding.