I can gag you can gag he can gag we can gag you can gag they can gag
V-ing form
I can be gagging you can be gagging he can be gagging we can be gagging you can be gagging they can be gagging
Perfect
I can have gagged you can have gagged he can have gagged we can have gagged you can have gagged they can have gagged
V-ing perfect
I can have been gagging you can have been gagging he can have been gagging we can have been gagging you can have been gagging they can have been gagging
Negation
Simple form
I can't gag you can't gag he can't gag we can't gag you can't gag they can't gag
V-ing form
I can't be gagging you can't be gagging he can't be gagging we can't be gagging you can't be gagging they can't be gagging
Perfect
I can't have gagged you can't have gagged he can't have gagged we can't have gagged you can't have gagged they can't have gagged
V-ing perfect
I can't have been gagging you can't have been gagging he can't have been gagging we can't have been gagging you can't have been gagging they can't have been gagging
Interrogative form
Simple form
can I gag? can you gag? can he gag? can we gag? can you gag? can they gag?
V-ing form
can I be gagging? can you be gagging? can he be gagging? can we be gagging? can you be gagging? can they be gagging?
Perfect
can I have gagged? can you have gagged? can he have gagged? can we have gagged? can you have gagged? can they have gagged?
V-ing perfect
can I have been gagging? can you have been gagging? can he have been gagging? can we have been gagging? can you have been gagging? can they have been gagging?
Interro-negative form
Simple form
can't I gag? can't you gag? can't he gag? can't we gag? can't you gag? can't they gag?
V-ing form
can't I be gagging? can't you be gagging? can't he be gagging? can't we be gagging? can't you be gagging? can't they be gagging?
Perfect
can't I have gagged? can't you have gagged? can't he have gagged? can't we have gagged? can't you have gagged? can't they have gagged?
V-ing perfect
can't I have been gagging? can't you have been gagging? can't he have been gagging? can't we have been gagging? can't you have been gagging? can't they have been gagging?