must thrum
Regular verb: thrum - thrumed- thrumed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must thrum
you must thrum
he must thrum
we must thrum
you must thrum
they must thrum 	I must be thruming
you must be thruming
he must be thruming
we must be thruming
you must be thruming
they must be thruming	I must have thrumed
you must have thrumed
he must have thrumed
we must have thrumed
you must have thrumed
they must have thrumed	I must have been thruming
you must have been thruming
he must have been thruming
we must have been thruming
you must have been thruming
they must have been thruming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not thrum
you must not thrum
he must not thrum
we must not thrum
you must not thrum
they must not thrum 	I must not be thruming
you must not be thruming
he must not be thruming
we must not be thruming
you must not be thruming
they must not be thruming	I must not have thrumed
you must not have thrumed
he must not have thrumed
we must not have thrumed
you must not have thrumed
they must not have thrumed	I must not have been thruming
you must not have been thruming
he must not have been thruming
we must not have been thruming
you must not have been thruming
they must not have been thruming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I thrum?
must you thrum?
must he thrum?
must we thrum?
must you thrum?
must they thrum? 	must I be thruming?
must you be thruming?
must he be thruming?
must we be thruming?
must you be thruming?
must they be thruming? 	must I have thrumed?
must you have thrumed?
must he have thrumed?
must we have thrumed?
must you have thrumed?
must they have thrumed? 	must I have been thruming?
must you have been thruming?
must he have been thruming?
must we have been thruming?
must you have been thruming?
must they have been thruming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not thrum?
must you not thrum?
must he not thrum?
must we not thrum?
must you not thrum?
must they not thrum? 	must I not be thruming?
must you not be thruming?
must he not be thruming?
must we not be thruming?
must you not be thruming?
must they not be thruming? 	must I not have thrumed?
must you not have thrumed?
must he not have thrumed?
must we not have thrumed?
must you not have thrumed?
must they not have thrumed? 	must I not have been thruming?
must you not have been thruming?
must he not have been thruming?
must we not have been thruming?
must you not have been thruming?
must they not have been thruming?