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