The phrase list here is terrible! Cantonese has 6 or 7 tones to go with the sounds. If you don't get the tones, you will not be understood. Why is this section so poor compared to the Chinese phrasebook? There they use standard pinyin and explanations of the tones.
There are standard systems for Cantonese as well. It's harder than Putonghua for sure, but worth doing right.
I belive the tones from 1-6 would be very simple and effective, the Yale ones are screwed and ineficent Enlil Ninlil 23:44, 21 Feb 2006 (EST)
Also cantonese is a language because Putongwa or manderin abd Yue and uninteligable. ANy language could use chinese charactors with some addaptions.