English verb conjugation
COULD YANK

Regular verb: yank - yanked - yanked

Affirmation

Simple form	V-ing form
I could yank you could yank he could yank we could yank you could yank they could yank	I could be yanking you could be yanking he could be yanking we could be yanking you could be yanking they could be yanking
Perfect	V-ing perfect
I could have yanked you could have yanked he could have yanked we could have yanked you could have yanked they could have yanked	I could have been yanking you could have been yanking he could have been yanking we could have been yanking you could have been yanking they could have been yanking

Negation

Simple form	V-ing form
I could not yank you could not yank he could not yank we could not yank you could not yank they could not yank	I could not be yanking you could not be yanking he could not be yanking we could not be yanking you could not be yanking they could not be yanking
Perfect	V-ing perfect
I could not have yanked you could not have yanked he could not have yanked we could not have yanked you could not have yanked they could not have yanked	I could not have been yanking you could not have been yanking he could not have been yanking we could not have been yanking you could not have been yanking they could not have been yanking

Interrogative form

Simple form	V-ing form
could I yank? could you yank? could he yank? could we yank? could you yank? could they yank?	could I be yanking? could you be yanking? could he be yanking? could we be yanking? could you be yanking? could they be yanking?
Perfect	V-ing perfect
could I have yanked? could you have yanked? could he have yanked? could we have yanked? could you have yanked? could they have yanked?	could I have been yanking? could you have been yanking? could he have been yanking? could we have been yanking? could you have been yanking? could they have been yanking?

Interro-negative form

Simple form	V-ing form
could I not yank? could you not yank? could he not yank? could we not yank? could you not yank? could they not yank?	could I not be yanking? could you not be yanking? could he not be yanking? could we not be yanking? could you not be yanking? could they not be yanking?
Perfect	V-ing perfect
could I not have yanked? could you not have yanked? could he not have yanked? could we not have yanked? could you not have yanked? could they not have yanked?	could I not have been yanking? could you not have been yanking? could he not have been yanking? could we not have been yanking? could you not have been yanking? could they not have been yanking?