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 cannot gag you cannot gag he cannot gag we cannot gag you cannot gag they cannot gag
V-ing form
I cannot be gagging you cannot be gagging he cannot be gagging we cannot be gagging you cannot be gagging they cannot be gagging
Perfect
I cannot have gagged you cannot have gagged he cannot have gagged we cannot have gagged you cannot have gagged they cannot have gagged
V-ing perfect
I cannot have been gagging you cannot have been gagging he cannot have been gagging we cannot have been gagging you cannot have been gagging they cannot 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 I not gag? can you not gag? can he not gag? can we not gag? can you not gag? can they not gag?
V-ing form
can I not be gagging? can you not be gagging? can he not be gagging? can we not be gagging? can you not be gagging? can they not be gagging?
Perfect
can I not have gagged? can you not have gagged? can he not have gagged? can we not have gagged? can you not have gagged? can they not have gagged?
V-ing perfect
can I not have been gagging? can you not have been gagging? can he not have been gagging? can we not have been gagging? can you not have been gagging? can they not have been gagging?