could quadrate
Regular verb: quadrate - quadrated- quadrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could quadrate
you could quadrate
he could quadrate
we could quadrate
you could quadrate
they could quadrate 	I could be quadrating
you could be quadrating
he could be quadrating
we could be quadrating
you could be quadrating
they could be quadrating	I could have quadrated
you could have quadrated
he could have quadrated
we could have quadrated
you could have quadrated
they could have quadrated	I could have been quadrating
you could have been quadrating
he could have been quadrating
we could have been quadrating
you could have been quadrating
they could have been quadrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not quadrate
you could not quadrate
he could not quadrate
we could not quadrate
you could not quadrate
they could not quadrate 	I could not be quadrating
you could not be quadrating
he could not be quadrating
we could not be quadrating
you could not be quadrating
they could not be quadrating	I could not have quadrated
you could not have quadrated
he could not have quadrated
we could not have quadrated
you could not have quadrated
they could not have quadrated	I could not have been quadrating
you could not have been quadrating
he could not have been quadrating
we could not have been quadrating
you could not have been quadrating
they could not have been quadrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I quadrate?
could you quadrate?
could he quadrate?
could we quadrate?
could you quadrate?
could they quadrate? 	could I be quadrating?
could you be quadrating?
could he be quadrating?
could we be quadrating?
could you be quadrating?
could they be quadrating? 	could I have quadrated?
could you have quadrated?
could he have quadrated?
could we have quadrated?
could you have quadrated?
could they have quadrated? 	could I have been quadrating?
could you have been quadrating?
could he have been quadrating?
could we have been quadrating?
could you have been quadrating?
could they have been quadrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not quadrate?
could you not quadrate?
could he not quadrate?
could we not quadrate?
could you not quadrate?
could they not quadrate? 	could I not be quadrating?
could you not be quadrating?
could he not be quadrating?
could we not be quadrating?
could you not be quadrating?
could they not be quadrating? 	could I not have quadrated?
could you not have quadrated?
could he not have quadrated?
could we not have quadrated?
could you not have quadrated?
could they not have quadrated? 	could I not have been quadrating?
could you not have been quadrating?
could he not have been quadrating?
could we not have been quadrating?
could you not have been quadrating?
could they not have been quadrating?