听讲, attend a lecture; 听说, hear about ("hear tell")

Huh! I had to do a double-take on this because I had no idea you could say 听讲 in Mandarin. Actually, come to think of it, I have no idea when or how 讲 is used in Mandarin at all. >_> In Cantonese it's used the way Mandarin uses 说, and 听讲 means hear about/hear tell. Would not have guessed it could refer specifically to hearing a lecture!