'Shuō de' is a discourse marker used at the beginning of a sentence to introduce a new topic or shift focus — equivalent to 'speaking of...', 'by the way...', or 'that reminds me...' in English. It is not a verb-complement construction here (despite the character 得), but a fixed, grammaticalized phrase where 得 functions as a structural particle with no independent meaning. The two characters together form a cohesive unit that signals a conversational pivot.

This expression appears almost exclusively in informal spoken Chinese and is rarely found in formal writing. It typically follows a pause or change in topic and is often accompanied by rising intonation. While it literally contains the verb 说 ('to speak'), it does not convey literal speaking — rather, it marks pragmatic continuity between ideas. Learners should avoid confusing it with the complement marker 得 (as in 吃得好) or the verb 说得 (e.g., 他说得很好), which have entirely different grammatical roles and tones.