English verb conjugation
COULD DISK

Regular verb: disk - disked - disked

Affirmation

Simple form	V-ing form
I could disk you could disk she could disk we could disk you could disk they could disk	I could be disking you could be disking she could be disking we could be disking you could be disking they could be disking
Perfect	V-ing perfect
I could have disked you could have disked she could have disked we could have disked you could have disked they could have disked	I could have been disking you could have been disking she could have been disking we could have been disking you could have been disking they could have been disking

Negation

Simple form	V-ing form
I couldn't disk you couldn't disk she couldn't disk we couldn't disk you couldn't disk they couldn't disk	I couldn't be disking you couldn't be disking she couldn't be disking we couldn't be disking you couldn't be disking they couldn't be disking
Perfect	V-ing perfect
I couldn't have disked you couldn't have disked she couldn't have disked we couldn't have disked you couldn't have disked they couldn't have disked	I couldn't have been disking you couldn't have been disking she couldn't have been disking we couldn't have been disking you couldn't have been disking they couldn't have been disking

Interrogative form

Simple form	V-ing form
could I disk? could you disk? could she disk? could we disk? could you disk? could they disk?	could I be disking? could you be disking? could she be disking? could we be disking? could you be disking? could they be disking?
Perfect	V-ing perfect
could I have disked? could you have disked? could she have disked? could we have disked? could you have disked? could they have disked?	could I have been disking? could you have been disking? could she have been disking? could we have been disking? could you have been disking? could they have been disking?

Interro-negative form

Simple form	V-ing form
couldn't I disk? couldn't you disk? couldn't she disk? couldn't we disk? couldn't you disk? couldn't they disk?	couldn't I be disking? couldn't you be disking? couldn't she be disking? couldn't we be disking? couldn't you be disking? couldn't they be disking?
Perfect	V-ing perfect
couldn't I have disked? couldn't you have disked? couldn't she have disked? couldn't we have disked? couldn't you have disked? couldn't they have disked?	couldn't I have been disking? couldn't you have been disking? couldn't she have been disking? couldn't we have been disking? couldn't you have been disking? couldn't they have been disking?