English verb conjugation
COULD YUK

Regular verb: yuk - yuked - yuked

Affirmation

Simple form	V-ing form
I could yuk you could yuk he could yuk we could yuk you could yuk they could yuk	I could be yuking you could be yuking he could be yuking we could be yuking you could be yuking they could be yuking
Perfect	V-ing perfect
I could have yuked you could have yuked he could have yuked we could have yuked you could have yuked they could have yuked	I could have been yuking you could have been yuking he could have been yuking we could have been yuking you could have been yuking they could have been yuking

Negation

Simple form	V-ing form
I could not yuk you could not yuk he could not yuk we could not yuk you could not yuk they could not yuk	I could not be yuking you could not be yuking he could not be yuking we could not be yuking you could not be yuking they could not be yuking
Perfect	V-ing perfect
I could not have yuked you could not have yuked he could not have yuked we could not have yuked you could not have yuked they could not have yuked	I could not have been yuking you could not have been yuking he could not have been yuking we could not have been yuking you could not have been yuking they could not have been yuking

Interrogative form

Simple form	V-ing form
could I yuk? could you yuk? could he yuk? could we yuk? could you yuk? could they yuk?	could I be yuking? could you be yuking? could he be yuking? could we be yuking? could you be yuking? could they be yuking?
Perfect	V-ing perfect
could I have yuked? could you have yuked? could he have yuked? could we have yuked? could you have yuked? could they have yuked?	could I have been yuking? could you have been yuking? could he have been yuking? could we have been yuking? could you have been yuking? could they have been yuking?

Interro-negative form

Simple form	V-ing form
could I not yuk? could you not yuk? could he not yuk? could we not yuk? could you not yuk? could they not yuk?	could I not be yuking? could you not be yuking? could he not be yuking? could we not be yuking? could you not be yuking? could they not be yuking?
Perfect	V-ing perfect
could I not have yuked? could you not have yuked? could he not have yuked? could we not have yuked? could you not have yuked? could they not have yuked?	could I not have been yuking? could you not have been yuking? could he not have been yuking? could we not have been yuking? could you not have been yuking? could they not have been yuking?