English verb conjugation
COULD MEASURE

Regular verb: measure - measured - measured

Affirmation

Simple form	V-ing form
I could measure you could measure he could measure we could measure you could measure they could measure	I could be measuring you could be measuring he could be measuring we could be measuring you could be measuring they could be measuring
Perfect	V-ing perfect
I could have measured you could have measured he could have measured we could have measured you could have measured they could have measured	I could have been measuring you could have been measuring he could have been measuring we could have been measuring you could have been measuring they could have been measuring

Negation

Simple form	V-ing form
I could not measure you could not measure he could not measure we could not measure you could not measure they could not measure	I could not be measuring you could not be measuring he could not be measuring we could not be measuring you could not be measuring they could not be measuring
Perfect	V-ing perfect
I could not have measured you could not have measured he could not have measured we could not have measured you could not have measured they could not have measured	I could not have been measuring you could not have been measuring he could not have been measuring we could not have been measuring you could not have been measuring they could not have been measuring

Interrogative form

Simple form	V-ing form
could I measure? could you measure? could he measure? could we measure? could you measure? could they measure?	could I be measuring? could you be measuring? could he be measuring? could we be measuring? could you be measuring? could they be measuring?
Perfect	V-ing perfect
could I have measured? could you have measured? could he have measured? could we have measured? could you have measured? could they have measured?	could I have been measuring? could you have been measuring? could he have been measuring? could we have been measuring? could you have been measuring? could they have been measuring?

Interro-negative form

Simple form	V-ing form
could I not measure? could you not measure? could he not measure? could we not measure? could you not measure? could they not measure?	could I not be measuring? could you not be measuring? could he not be measuring? could we not be measuring? could you not be measuring? could they not be measuring?
Perfect	V-ing perfect
could I not have measured? could you not have measured? could he not have measured? could we not have measured? could you not have measured? could they not have measured?	could I not have been measuring? could you not have been measuring? could he not have been measuring? could we not have been measuring? could you not have been measuring? could they not have been measuring?