I can specify you can specify she can specify we can specify you can specify they can specify
V-ing form
I can be specifying you can be specifying she can be specifying we can be specifying you can be specifying they can be specifying
Perfect
I can have specified you can have specified she can have specified we can have specified you can have specified they can have specified
V-ing perfect
I can have been specifying you can have been specifying she can have been specifying we can have been specifying you can have been specifying they can have been specifying
Negation
Simple form
I can't specify you can't specify she can't specify we can't specify you can't specify they can't specify
V-ing form
I can't be specifying you can't be specifying she can't be specifying we can't be specifying you can't be specifying they can't be specifying
Perfect
I can't have specified you can't have specified she can't have specified we can't have specified you can't have specified they can't have specified
V-ing perfect
I can't have been specifying you can't have been specifying she can't have been specifying we can't have been specifying you can't have been specifying they can't have been specifying
Interrogative form
Simple form
can I specify? can you specify? can she specify? can we specify? can you specify? can they specify?
V-ing form
can I be specifying? can you be specifying? can she be specifying? can we be specifying? can you be specifying? can they be specifying?
Perfect
can I have specified? can you have specified? can she have specified? can we have specified? can you have specified? can they have specified?
V-ing perfect
can I have been specifying? can you have been specifying? can she have been specifying? can we have been specifying? can you have been specifying? can they have been specifying?
Interro-negative form
Simple form
can't I specify? can't you specify? can't she specify? can't we specify? can't you specify? can't they specify?
V-ing form
can't I be specifying? can't you be specifying? can't she be specifying? can't we be specifying? can't you be specifying? can't they be specifying?
Perfect
can't I have specified? can't you have specified? can't she have specified? can't we have specified? can't you have specified? can't they have specified?
V-ing perfect
can't I have been specifying? can't you have been specifying? can't she have been specifying? can't we have been specifying? can't you have been specifying? can't they have been specifying?