English verb conjugation
COULD DISC

Regular verb: disc - disced - disced

Affirmation

Simple form	V-ing form
I could disc you could disc he could disc we could disc you could disc they could disc	I could be discing you could be discing he could be discing we could be discing you could be discing they could be discing
Perfect	V-ing perfect
I could have disced you could have disced he could have disced we could have disced you could have disced they could have disced	I could have been discing you could have been discing he could have been discing we could have been discing you could have been discing they could have been discing

Negation

Simple form	V-ing form
I couldn't disc you couldn't disc he couldn't disc we couldn't disc you couldn't disc they couldn't disc	I couldn't be discing you couldn't be discing he couldn't be discing we couldn't be discing you couldn't be discing they couldn't be discing
Perfect	V-ing perfect
I couldn't have disced you couldn't have disced he couldn't have disced we couldn't have disced you couldn't have disced they couldn't have disced	I couldn't have been discing you couldn't have been discing he couldn't have been discing we couldn't have been discing you couldn't have been discing they couldn't have been discing

Interrogative form

Simple form	V-ing form
could I disc? could you disc? could he disc? could we disc? could you disc? could they disc?	could I be discing? could you be discing? could he be discing? could we be discing? could you be discing? could they be discing?
Perfect	V-ing perfect
could I have disced? could you have disced? could he have disced? could we have disced? could you have disced? could they have disced?	could I have been discing? could you have been discing? could he have been discing? could we have been discing? could you have been discing? could they have been discing?

Interro-negative form

Simple form	V-ing form
couldn't I disc? couldn't you disc? couldn't he disc? couldn't we disc? couldn't you disc? couldn't they disc?	couldn't I be discing? couldn't you be discing? couldn't he be discing? couldn't we be discing? couldn't you be discing? couldn't they be discing?
Perfect	V-ing perfect
couldn't I have disced? couldn't you have disced? couldn't he have disced? couldn't we have disced? couldn't you have disced? couldn't they have disced?	couldn't I have been discing? couldn't you have been discing? couldn't he have been discing? couldn't we have been discing? couldn't you have been discing? couldn't they have been discing?