I could pronounce you could pronounce he could pronounce we could pronounce you could pronounce they could pronounce
V-ing form
I could be pronouncing you could be pronouncing he could be pronouncing we could be pronouncing you could be pronouncing they could be pronouncing
Perfect
I could have pronounced you could have pronounced he could have pronounced we could have pronounced you could have pronounced they could have pronounced
V-ing perfect
I could have been pronouncing you could have been pronouncing he could have been pronouncing we could have been pronouncing you could have been pronouncing they could have been pronouncing
Negation
Simple form
I couldn't pronounce you couldn't pronounce he couldn't pronounce we couldn't pronounce you couldn't pronounce they couldn't pronounce
V-ing form
I couldn't be pronouncing you couldn't be pronouncing he couldn't be pronouncing we couldn't be pronouncing you couldn't be pronouncing they couldn't be pronouncing
Perfect
I couldn't have pronounced you couldn't have pronounced he couldn't have pronounced we couldn't have pronounced you couldn't have pronounced they couldn't have pronounced
V-ing perfect
I couldn't have been pronouncing you couldn't have been pronouncing he couldn't have been pronouncing we couldn't have been pronouncing you couldn't have been pronouncing they couldn't have been pronouncing
Interrogative form
Simple form
could I pronounce? could you pronounce? could he pronounce? could we pronounce? could you pronounce? could they pronounce?
V-ing form
could I be pronouncing? could you be pronouncing? could he be pronouncing? could we be pronouncing? could you be pronouncing? could they be pronouncing?
Perfect
could I have pronounced? could you have pronounced? could he have pronounced? could we have pronounced? could you have pronounced? could they have pronounced?
V-ing perfect
could I have been pronouncing? could you have been pronouncing? could he have been pronouncing? could we have been pronouncing? could you have been pronouncing? could they have been pronouncing?
Interro-negative form
Simple form
couldn't I pronounce? couldn't you pronounce? couldn't he pronounce? couldn't we pronounce? couldn't you pronounce? couldn't they pronounce?
V-ing form
couldn't I be pronouncing? couldn't you be pronouncing? couldn't he be pronouncing? couldn't we be pronouncing? couldn't you be pronouncing? couldn't they be pronouncing?
Perfect
couldn't I have pronounced? couldn't you have pronounced? couldn't he have pronounced? couldn't we have pronounced? couldn't you have pronounced? couldn't they have pronounced?
V-ing perfect
couldn't I have been pronouncing? couldn't you have been pronouncing? couldn't he have been pronouncing? couldn't we have been pronouncing? couldn't you have been pronouncing? couldn't they have been pronouncing?