I could troll you could troll she could troll we could troll you could troll they could troll
V-ing form
I could be trolling you could be trolling she could be trolling we could be trolling you could be trolling they could be trolling
Perfect
I could have trolled you could have trolled she 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 she could have been trolling we could have been trolling you could have been trolling they could have been trolling
Negation
Simple form
I could not troll you could not troll she could not troll we could not troll you could not troll they could not troll
V-ing form
I could not be trolling you could not be trolling she could not be trolling we could not be trolling you could not be trolling they could not be trolling
Perfect
I could not have trolled you could not have trolled she could not have trolled we could not have trolled you could not have trolled they could not have trolled
V-ing perfect
I could not have been trolling you could not have been trolling she could not have been trolling we could not have been trolling you could not have been trolling they could not have been trolling
Interrogative form
Simple form
could I troll? could you troll? could she troll? could we troll? could you troll? could they troll?
V-ing form
could I be trolling? could you be trolling? could she be trolling? could we be trolling? could you be trolling? could they be trolling?
Perfect
could I have trolled? could you have trolled? could she 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 she have been trolling? could we have been trolling? could you have been trolling? could they have been trolling?
Interro-negative form
Simple form
could I not troll? could you not troll? could she not troll? could we not troll? could you not troll? could they not troll?
V-ing form
could I not be trolling? could you not be trolling? could she not be trolling? could we not be trolling? could you not be trolling? could they not be trolling?
Perfect
could I not have trolled? could you not have trolled? could she not have trolled? could we not have trolled? could you not have trolled? could they not have trolled?
V-ing perfect
could I not have been trolling? could you not have been trolling? could she not have been trolling? could we not have been trolling? could you not have been trolling? could they not have been trolling?