can ferment
Regular verb: ferment - fermented- fermented

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't ferment
you can't ferment
she can't ferment
we can't ferment
you can't ferment
they can't ferment 	I can't be fermenting
you can't be fermenting
she can't be fermenting
we can't be fermenting
you can't be fermenting
they can't be fermenting	I can't have fermented
you can't have fermented
she can't have fermented
we can't have fermented
you can't have fermented
they can't have fermented	I can't have been fermenting
you can't have been fermenting
she can't have been fermenting
we can't have been fermenting
you can't have been fermenting
they can't have been fermenting	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I ferment?
can't you ferment?
can't she ferment?
can't we ferment?
can't you ferment?
can't they ferment? 	can't I be fermenting?
can't you be fermenting?
can't she be fermenting?
can't we be fermenting?
can't you be fermenting?
can't they be fermenting? 	can't I have fermented?
can't you have fermented?
can't she have fermented?
can't we have fermented?
can't you have fermented?
can't they have fermented? 	can't I have been fermenting?
can't you have been fermenting?
can't she have been fermenting?
can't we have been fermenting?
can't you have been fermenting?
can't they have been fermenting?