English verb conjugation
COULD DISK

Regular verb: disk - disked - disked

Affirmation

Simple form	V-ing form
I could disk you could disk he could disk we could disk you could disk they could disk	I could be disking you could be disking he 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 he 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 he 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 could not disk you could not disk he could not disk we could not disk you could not disk they could not disk	I could not be disking you could not be disking he could not be disking we could not be disking you could not be disking they could not be disking
Perfect	V-ing perfect
I could not have disked you could not have disked he could not have disked we could not have disked you could not have disked they could not have disked	I could not have been disking you could not have been disking he could not have been disking we could not have been disking you could not have been disking they could not have been disking

Interrogative form

Simple form	V-ing form
could I disk? could you disk? could he disk? could we disk? could you disk? could they disk?	could I be disking? could you be disking? could he 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 he 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 he 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
could I not disk? could you not disk? could he not disk? could we not disk? could you not disk? could they not disk?	could I not be disking? could you not be disking? could he not be disking? could we not be disking? could you not be disking? could they not be disking?
Perfect	V-ing perfect
could I not have disked? could you not have disked? could he not have disked? could we not have disked? could you not have disked? could they not have disked?	could I not have been disking? could you not have been disking? could he not have been disking? could we not have been disking? could you not have been disking? could they not have been disking?