Happy birthday in Cantonese is the same as in Mandarin, written as "happy birthday" or "happy birthday".
Pronunciation: seng (with nasal sound), pronounce it once. The pronunciation of the word "chen" is probably similar to the pronunciation of "生". Of course, this is just to say that it is almost the same, similar, not the same. It also has a nasal sound, but you have to press down when pronouncing it. The last two characters are pronounced fai lo, and the pronunciation is shorter.
"Birthday" means "birthday". Birthday horoscopes were widely used in old Chinese folk customs. Especially when getting engaged in the old days, both men and women would write their birthday horoscopes on Geng stickers and exchange them with each other to predict whether the marriage would be a good one.
Extended information
The pronunciation system of Cantonese is relatively complex, with up to 20 initial consonants and 94 finals.
Nine tones and six tones: yin level, yin up, yin going, yang level, yang up, yang going, yin in, middle in, yang in.
The representative characters of the nine tones are: poetry (si1); history (si2); trial (si3); time (si4); city (si5); matter (si6); color (sik1); tin (sik3); food (sik).
The representative characters of the six tone values ??are: Zhou (zau1); Mouth (hau2); Store (dim3); River (ho); Mu (mou5); Crossing (dou6).
Baidu Encyclopedia: Cantonese