I could calibrate you could calibrate he could calibrate we could calibrate you could calibrate they could calibrate
V-ing form
I could be calibrating you could be calibrating he could be calibrating we could be calibrating you could be calibrating they could be calibrating
Perfect
I could have calibrated you could have calibrated he could have calibrated we could have calibrated you could have calibrated they could have calibrated
V-ing perfect
I could have been calibrating you could have been calibrating he could have been calibrating we could have been calibrating you could have been calibrating they could have been calibrating
Negation
Simple form
I could not calibrate you could not calibrate he could not calibrate we could not calibrate you could not calibrate they could not calibrate
V-ing form
I could not be calibrating you could not be calibrating he could not be calibrating we could not be calibrating you could not be calibrating they could not be calibrating
Perfect
I could not have calibrated you could not have calibrated he could not have calibrated we could not have calibrated you could not have calibrated they could not have calibrated
V-ing perfect
I could not have been calibrating you could not have been calibrating he could not have been calibrating we could not have been calibrating you could not have been calibrating they could not have been calibrating
Interrogative form
Simple form
could I calibrate? could you calibrate? could he calibrate? could we calibrate? could you calibrate? could they calibrate?
V-ing form
could I be calibrating? could you be calibrating? could he be calibrating? could we be calibrating? could you be calibrating? could they be calibrating?
Perfect
could I have calibrated? could you have calibrated? could he have calibrated? could we have calibrated? could you have calibrated? could they have calibrated?
V-ing perfect
could I have been calibrating? could you have been calibrating? could he have been calibrating? could we have been calibrating? could you have been calibrating? could they have been calibrating?
Interro-negative form
Simple form
could I not calibrate? could you not calibrate? could he not calibrate? could we not calibrate? could you not calibrate? could they not calibrate?
V-ing form
could I not be calibrating? could you not be calibrating? could he not be calibrating? could we not be calibrating? could you not be calibrating? could they not be calibrating?
Perfect
could I not have calibrated? could you not have calibrated? could he not have calibrated? could we not have calibrated? could you not have calibrated? could they not have calibrated?
V-ing perfect
could I not have been calibrating? could you not have been calibrating? could he not have been calibrating? could we not have been calibrating? could you not have been calibrating? could they not have been calibrating?