English verb conjugation
COULD CLANK

Regular verb: clank - clanked - clanked

Affirmation

Simple form	V-ing form
I could clank you could clank he could clank we could clank you could clank they could clank	I could be clanking you could be clanking he could be clanking we could be clanking you could be clanking they could be clanking
Perfect	V-ing perfect
I could have clanked you could have clanked he could have clanked we could have clanked you could have clanked they could have clanked	I could have been clanking you could have been clanking he could have been clanking we could have been clanking you could have been clanking they could have been clanking

Negation

Simple form	V-ing form
I could not clank you could not clank he could not clank we could not clank you could not clank they could not clank	I could not be clanking you could not be clanking he could not be clanking we could not be clanking you could not be clanking they could not be clanking
Perfect	V-ing perfect
I could not have clanked you could not have clanked he could not have clanked we could not have clanked you could not have clanked they could not have clanked	I could not have been clanking you could not have been clanking he could not have been clanking we could not have been clanking you could not have been clanking they could not have been clanking

Interrogative form

Simple form	V-ing form
could I clank? could you clank? could he clank? could we clank? could you clank? could they clank?	could I be clanking? could you be clanking? could he be clanking? could we be clanking? could you be clanking? could they be clanking?
Perfect	V-ing perfect
could I have clanked? could you have clanked? could he have clanked? could we have clanked? could you have clanked? could they have clanked?	could I have been clanking? could you have been clanking? could he have been clanking? could we have been clanking? could you have been clanking? could they have been clanking?

Interro-negative form

Simple form	V-ing form
could I not clank? could you not clank? could he not clank? could we not clank? could you not clank? could they not clank?	could I not be clanking? could you not be clanking? could he not be clanking? could we not be clanking? could you not be clanking? could they not be clanking?
Perfect	V-ing perfect
could I not have clanked? could you not have clanked? could he not have clanked? could we not have clanked? could you not have clanked? could they not have clanked?	could I not have been clanking? could you not have been clanking? could he not have been clanking? could we not have been clanking? could you not have been clanking? could they not have been clanking?