d - It is English 'd' pronounced softly.
f- Equivalent to English 'f'.
g- If followed by 'a', 'o' or 'u' it is pronounced as g in English garden, god, gun.
- When followed by 'e' or 'i' it is pronounced as 'ge' in English flange.
- If gu is followed by 'a' , 'o' or 'u' it is pronounced as 'gw'.
- gue/gui is normally pronounced as English gue~gi but exceptions are there as the Portuguese word aguentar is pronounced agwentar which means to hold up.