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 couldn't clank you couldn't clank he couldn't clank we couldn't clank you couldn't clank they couldn't clank	I couldn't be clanking you couldn't be clanking he couldn't be clanking we couldn't be clanking you couldn't be clanking they couldn't be clanking
Perfect	V-ing perfect
I couldn't have clanked you couldn't have clanked he couldn't have clanked we couldn't have clanked you couldn't have clanked they couldn't have clanked	I couldn't have been clanking you couldn't have been clanking he couldn't have been clanking we couldn't have been clanking you couldn't have been clanking they couldn't 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
couldn't I clank? couldn't you clank? couldn't he clank? couldn't we clank? couldn't you clank? couldn't they clank?	couldn't I be clanking? couldn't you be clanking? couldn't he be clanking? couldn't we be clanking? couldn't you be clanking? couldn't they be clanking?
Perfect	V-ing perfect
couldn't I have clanked? couldn't you have clanked? couldn't he have clanked? couldn't we have clanked? couldn't you have clanked? couldn't they have clanked?	couldn't I have been clanking? couldn't you have been clanking? couldn't he have been clanking? couldn't we have been clanking? couldn't you have been clanking? couldn't they have been clanking?