I can ferment you can ferment she can ferment we can ferment you can ferment they can ferment
V-ing form
I can be fermenting you can be fermenting she can be fermenting we can be fermenting you can be fermenting they can be fermenting
Perfect
I can have fermented you can have fermented she can have fermented we can have fermented you can have fermented they can have fermented
V-ing perfect
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
I cannot ferment you cannot ferment she cannot ferment we cannot ferment you cannot ferment they cannot ferment
V-ing form
I cannot be fermenting you cannot be fermenting she cannot be fermenting we cannot be fermenting you cannot be fermenting they cannot be fermenting
Perfect
I cannot have fermented you cannot have fermented she cannot have fermented we cannot have fermented you cannot have fermented they cannot have fermented
V-ing perfect
I cannot have been fermenting you cannot have been fermenting she cannot have been fermenting we cannot have been fermenting you cannot have been fermenting they cannot have been fermenting
Interrogative form
Simple form
can I ferment? can you ferment? can she ferment? can we ferment? can you ferment? can they ferment?
V-ing form
can I be fermenting? can you be fermenting? can she be fermenting? can we be fermenting? can you be fermenting? can they be fermenting?
Perfect
can I have fermented? can you have fermented? can she have fermented? can we have fermented? can you have fermented? can they have fermented?
V-ing perfect
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
can I not ferment? can you not ferment? can she not ferment? can we not ferment? can you not ferment? can they not ferment?
V-ing form
can I not be fermenting? can you not be fermenting? can she not be fermenting? can we not be fermenting? can you not be fermenting? can they not be fermenting?
Perfect
can I not have fermented? can you not have fermented? can she not have fermented? can we not have fermented? can you not have fermented? can they not have fermented?
V-ing perfect
can I not have been fermenting? can you not have been fermenting? can she not have been fermenting? can we not have been fermenting? can you not have been fermenting? can they not have been fermenting?