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