English verb conjugation
COULD FERMENT

Regular verb: ferment - fermented - fermented

Affirmation

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

Negation

Simple form	V-ing form
I couldn't ferment you couldn't ferment he couldn't ferment we couldn't ferment you couldn't ferment they couldn't ferment	I couldn't be fermenting you couldn't be fermenting he couldn't be fermenting we couldn't be fermenting you couldn't be fermenting they couldn't be fermenting
Perfect	V-ing perfect
I couldn't have fermented you couldn't have fermented he couldn't have fermented we couldn't have fermented you couldn't have fermented they couldn't have fermented	I couldn't have been fermenting you couldn't have been fermenting he couldn't have been fermenting we couldn't have been fermenting you couldn't have been fermenting they couldn't have been fermenting

Interrogative form

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

Interro-negative form

Simple form	V-ing form
couldn't I ferment? couldn't you ferment? couldn't he ferment? couldn't we ferment? couldn't you ferment? couldn't they ferment?	couldn't I be fermenting? couldn't you be fermenting? couldn't he be fermenting? couldn't we be fermenting? couldn't you be fermenting? couldn't they be fermenting?
Perfect	V-ing perfect
couldn't I have fermented? couldn't you have fermented? couldn't he have fermented? couldn't we have fermented? couldn't you have fermented? couldn't they have fermented?	couldn't I have been fermenting? couldn't you have been fermenting? couldn't he have been fermenting? couldn't we have been fermenting? couldn't you have been fermenting? couldn't they have been fermenting?