English verb conjugation
COULD CALIBRATE

Regular verb: calibrate - calibrated - calibrated

Affirmation

Simple form	V-ing form
I could calibrate you could calibrate he could calibrate we could calibrate you could calibrate they could calibrate	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	V-ing 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	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	V-ing form
I couldn't calibrate you couldn't calibrate he couldn't calibrate we couldn't calibrate you couldn't calibrate they couldn't calibrate	I couldn't be calibrating you couldn't be calibrating he couldn't be calibrating we couldn't be calibrating you couldn't be calibrating they couldn't be calibrating
Perfect	V-ing perfect
I couldn't have calibrated you couldn't have calibrated he couldn't have calibrated we couldn't have calibrated you couldn't have calibrated they couldn't have calibrated	I couldn't have been calibrating you couldn't have been calibrating he couldn't have been calibrating we couldn't have been calibrating you couldn't have been calibrating they couldn't have been calibrating

Interrogative form

Simple form	V-ing form
could I calibrate? could you calibrate? could he calibrate? could we calibrate? could you calibrate? could they calibrate?	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	V-ing 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?	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	V-ing form
couldn't I calibrate? couldn't you calibrate? couldn't he calibrate? couldn't we calibrate? couldn't you calibrate? couldn't they calibrate?	couldn't I be calibrating? couldn't you be calibrating? couldn't he be calibrating? couldn't we be calibrating? couldn't you be calibrating? couldn't they be calibrating?
Perfect	V-ing perfect
couldn't I have calibrated? couldn't you have calibrated? couldn't he have calibrated? couldn't we have calibrated? couldn't you have calibrated? couldn't they have calibrated?	couldn't I have been calibrating? couldn't you have been calibrating? couldn't he have been calibrating? couldn't we have been calibrating? couldn't you have been calibrating? couldn't they have been calibrating?