I could specify you could specify he could specify we could specify you could specify they could specify
V-ing form
I could be specifying you could be specifying he could be specifying we could be specifying you could be specifying they could be specifying
Perfect
I could have specified you could have specified he could have specified we could have specified you could have specified they could have specified
V-ing perfect
I could have been specifying you could have been specifying he could have been specifying we could have been specifying you could have been specifying they could have been specifying
Negation
Simple form
I could not specify you could not specify he could not specify we could not specify you could not specify they could not specify
V-ing form
I could not be specifying you could not be specifying he could not be specifying we could not be specifying you could not be specifying they could not be specifying
Perfect
I could not have specified you could not have specified he could not have specified we could not have specified you could not have specified they could not have specified
V-ing perfect
I could not have been specifying you could not have been specifying he could not have been specifying we could not have been specifying you could not have been specifying they could not have been specifying
Interrogative form
Simple form
could I specify? could you specify? could he specify? could we specify? could you specify? could they specify?
V-ing form
could I be specifying? could you be specifying? could he be specifying? could we be specifying? could you be specifying? could they be specifying?
Perfect
could I have specified? could you have specified? could he have specified? could we have specified? could you have specified? could they have specified?
V-ing perfect
could I have been specifying? could you have been specifying? could he have been specifying? could we have been specifying? could you have been specifying? could they have been specifying?
Interro-negative form
Simple form
could I not specify? could you not specify? could he not specify? could we not specify? could you not specify? could they not specify?
V-ing form
could I not be specifying? could you not be specifying? could he not be specifying? could we not be specifying? could you not be specifying? could they not be specifying?
Perfect
could I not have specified? could you not have specified? could he not have specified? could we not have specified? could you not have specified? could they not have specified?
V-ing perfect
could I not have been specifying? could you not have been specifying? could he not have been specifying? could we not have been specifying? could you not have been specifying? could they not have been specifying?