講廣東話時，應該點擺條俐？

運暗勁伸直條脷，千祈唔好郁！

2012-03-20 19:27:04 補充：
係咁上下，你慢慢pracitice 下吧

it depends on the sound you are producing, for example, if you are pronuncing sounds with tongue tip, (e.g. /s/ 絲), then your tongue shud be pressing against the back of your lower front teeth.

in cantonese, there are so called "懶音", in which people mix up /-n/ (eg. 鏟)& /-ng/(eg. 橙) sounds. for /-n/, the tongue tip should touch the back of the upper front teeth; for /-ng/, the tongue tip should Not touch the teeth but with tongue base retraction.