must ferment
Regular verb: ferment - fermented- fermented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ferment
you must ferment
he must ferment
we must ferment
you must ferment
they must ferment 	I must be fermenting
you must be fermenting
he must be fermenting
we must be fermenting
you must be fermenting
they must be fermenting	I must have fermented
you must have fermented
he must have fermented
we must have fermented
you must have fermented
they must have fermented	I must have been fermenting
you must have been fermenting
he must have been fermenting
we must have been fermenting
you must have been fermenting
they must have been fermenting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not ferment
you must not ferment
he must not ferment
we must not ferment
you must not ferment
they must not ferment 	I must not be fermenting
you must not be fermenting
he must not be fermenting
we must not be fermenting
you must not be fermenting
they must not be fermenting	I must not have fermented
you must not have fermented
he must not have fermented
we must not have fermented
you must not have fermented
they must not have fermented	I must not have been fermenting
you must not have been fermenting
he must not have been fermenting
we must not have been fermenting
you must not have been fermenting
they must not have been fermenting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ferment?
must you ferment?
must he ferment?
must we ferment?
must you ferment?
must they ferment? 	must I be fermenting?
must you be fermenting?
must he be fermenting?
must we be fermenting?
must you be fermenting?
must they be fermenting? 	must I have fermented?
must you have fermented?
must he have fermented?
must we have fermented?
must you have fermented?
must they have fermented? 	must I have been fermenting?
must you have been fermenting?
must he have been fermenting?
must we have been fermenting?
must you have been fermenting?
must they have been fermenting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not ferment?
must you not ferment?
must he not ferment?
must we not ferment?
must you not ferment?
must they not ferment? 	must I not be fermenting?
must you not be fermenting?
must he not be fermenting?
must we not be fermenting?
must you not be fermenting?
must they not be fermenting? 	must I not have fermented?
must you not have fermented?
must he not have fermented?
must we not have fermented?
must you not have fermented?
must they not have fermented? 	must I not have been fermenting?
must you not have been fermenting?
must he not have been fermenting?
must we not have been fermenting?
must you not have been fermenting?
must they not have been fermenting?