I am confused about how to construct (and understand) phrases that involve: 得 and its negative 唔得 with a verb.
Specifically, what is the difference between 唔得買，冇買得。
A corresponding confusion would be how to say the following in cantonese: wasn’t able to buy, don’t buy. Are there other patterns i should know?
Please suggest a definitive rule for this. Thanks
買 = buy
買[得] = [can] buy (allowed to buy)
[唔]買[得] = [can't] buy (not allowed to buy)
[冇得]買 = [not available] to buy
食 = eat
食[得] = [can] eat (allowed to eat)
[唔]食[得] = [can't] eat (not allowed to eat)
[冇得]食 = [not available] to eat
For "don't" it is "唔好"
Example:
唔好買貴嘢 = don't buy expensive stuff
唔好食太多鹽 = don't eat too much salt
Notice:
[唔好][食] = [don't][eat]
[唔][好食] = [not] [tasting good]