must quench
Regular verb: quench - quenched- quenched

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

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

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

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