could quench
Regular verb: quench - quenched- quenched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could quench
you could quench
he could quench
we could quench
you could quench
they could quench 	I could be quenching
you could be quenching
he could be quenching
we could be quenching
you could be quenching
they could be quenching	I could have quenched
you could have quenched
he could have quenched
we could have quenched
you could have quenched
they could have quenched	I could have been quenching
you could have been quenching
he could have been quenching
we could have been quenching
you could have been quenching
they could have been quenching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not quench
you could not quench
he could not quench
we could not quench
you could not quench
they could not quench 	I could not be quenching
you could not be quenching
he could not be quenching
we could not be quenching
you could not be quenching
they could not be quenching	I could not have quenched
you could not have quenched
he could not have quenched
we could not have quenched
you could not have quenched
they could not have quenched	I could not have been quenching
you could not have been quenching
he could not have been quenching
we could not have been quenching
you could not have been quenching
they could not have been quenching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I quench?
could you quench?
could he quench?
could we quench?
could you quench?
could they quench? 	could I be quenching?
could you be quenching?
could he be quenching?
could we be quenching?
could you be quenching?
could they be quenching? 	could I have quenched?
could you have quenched?
could he have quenched?
could we have quenched?
could you have quenched?
could they have quenched? 	could I have been quenching?
could you have been quenching?
could he have been quenching?
could we have been quenching?
could you have been quenching?
could they have been quenching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not quench?
could you not quench?
could he not quench?
could we not quench?
could you not quench?
could they not quench? 	could I not be quenching?
could you not be quenching?
could he not be quenching?
could we not be quenching?
could you not be quenching?
could they not be quenching? 	could I not have quenched?
could you not have quenched?
could he not have quenched?
could we not have quenched?
could you not have quenched?
could they not have quenched? 	could I not have been quenching?
could you not have been quenching?
could he not have been quenching?
could we not have been quenching?
could you not have been quenching?
could they not have been quenching?