English verb conjugation
COULD PLONK

Regular verb: plonk - plonked - plonked

Affirmation

Simple form	V-ing form
I could plonk you could plonk he could plonk we could plonk you could plonk they could plonk	I could be plonking you could be plonking he could be plonking we could be plonking you could be plonking they could be plonking
Perfect	V-ing perfect
I could have plonked you could have plonked he could have plonked we could have plonked you could have plonked they could have plonked	I could have been plonking you could have been plonking he could have been plonking we could have been plonking you could have been plonking they could have been plonking

Negation

Simple form	V-ing form
I could not plonk you could not plonk he could not plonk we could not plonk you could not plonk they could not plonk	I could not be plonking you could not be plonking he could not be plonking we could not be plonking you could not be plonking they could not be plonking
Perfect	V-ing perfect
I could not have plonked you could not have plonked he could not have plonked we could not have plonked you could not have plonked they could not have plonked	I could not have been plonking you could not have been plonking he could not have been plonking we could not have been plonking you could not have been plonking they could not have been plonking

Interrogative form

Simple form	V-ing form
could I plonk? could you plonk? could he plonk? could we plonk? could you plonk? could they plonk?	could I be plonking? could you be plonking? could he be plonking? could we be plonking? could you be plonking? could they be plonking?
Perfect	V-ing perfect
could I have plonked? could you have plonked? could he have plonked? could we have plonked? could you have plonked? could they have plonked?	could I have been plonking? could you have been plonking? could he have been plonking? could we have been plonking? could you have been plonking? could they have been plonking?

Interro-negative form

Simple form	V-ing form
could I not plonk? could you not plonk? could he not plonk? could we not plonk? could you not plonk? could they not plonk?	could I not be plonking? could you not be plonking? could he not be plonking? could we not be plonking? could you not be plonking? could they not be plonking?
Perfect	V-ing perfect
could I not have plonked? could you not have plonked? could he not have plonked? could we not have plonked? could you not have plonked? could they not have plonked?	could I not have been plonking? could you not have been plonking? could he not have been plonking? could we not have been plonking? could you not have been plonking? could they not have been plonking?