must doom
Regular verb: doom - doomed- doomed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must doom
you must doom
she must doom
we must doom
you must doom
they must doom 	I must be dooming
you must be dooming
she must be dooming
we must be dooming
you must be dooming
they must be dooming	I must have doomed
you must have doomed
she must have doomed
we must have doomed
you must have doomed
they must have doomed	I must have been dooming
you must have been dooming
she must have been dooming
we must have been dooming
you must have been dooming
they must have been dooming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not doom
you must not doom
she must not doom
we must not doom
you must not doom
they must not doom 	I must not be dooming
you must not be dooming
she must not be dooming
we must not be dooming
you must not be dooming
they must not be dooming	I must not have doomed
you must not have doomed
she must not have doomed
we must not have doomed
you must not have doomed
they must not have doomed	I must not have been dooming
you must not have been dooming
she must not have been dooming
we must not have been dooming
you must not have been dooming
they must not have been dooming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I doom?
must you doom?
must she doom?
must we doom?
must you doom?
must they doom? 	must I be dooming?
must you be dooming?
must she be dooming?
must we be dooming?
must you be dooming?
must they be dooming? 	must I have doomed?
must you have doomed?
must she have doomed?
must we have doomed?
must you have doomed?
must they have doomed? 	must I have been dooming?
must you have been dooming?
must she have been dooming?
must we have been dooming?
must you have been dooming?
must they have been dooming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not doom?
must you not doom?
must she not doom?
must we not doom?
must you not doom?
must they not doom? 	must I not be dooming?
must you not be dooming?
must she not be dooming?
must we not be dooming?
must you not be dooming?
must they not be dooming? 	must I not have doomed?
must you not have doomed?
must she not have doomed?
must we not have doomed?
must you not have doomed?
must they not have doomed? 	must I not have been dooming?
must you not have been dooming?
must she not have been dooming?
must we not have been dooming?
must you not have been dooming?
must they not have been dooming?