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