I can specify you can specify he can specify we can specify you can specify they can specify
V-ing form
I can be specifying you can be specifying he can be specifying we can be specifying you can be specifying they can be specifying
Perfect
I can have specified you can have specified he 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 he 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 he 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 he 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 he 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 he 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 he specify? can we specify? can you specify? can they specify?
V-ing form
can I be specifying? can you be specifying? can he be specifying? can we be specifying? can you be specifying? can they be specifying?
Perfect
can I have specified? can you have specified? can he 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 he 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 he 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 he 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 he 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 he have been specifying? can't we have been specifying? can't you have been specifying? can't they have been specifying?