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