English verb conjugation
COULD CLUNK

Regular verb: clunk - clunked - clunked

Affirmation

Simple form	V-ing form
I could clunk you could clunk he could clunk we could clunk you could clunk they could clunk	I could be clunking you could be clunking he could be clunking we could be clunking you could be clunking they could be clunking
Perfect	V-ing perfect
I could have clunked you could have clunked he could have clunked we could have clunked you could have clunked they could have clunked	I could have been clunking you could have been clunking he could have been clunking we could have been clunking you could have been clunking they could have been clunking

Negation

Simple form	V-ing form
I couldn't clunk you couldn't clunk he couldn't clunk we couldn't clunk you couldn't clunk they couldn't clunk	I couldn't be clunking you couldn't be clunking he couldn't be clunking we couldn't be clunking you couldn't be clunking they couldn't be clunking
Perfect	V-ing perfect
I couldn't have clunked you couldn't have clunked he couldn't have clunked we couldn't have clunked you couldn't have clunked they couldn't have clunked	I couldn't have been clunking you couldn't have been clunking he couldn't have been clunking we couldn't have been clunking you couldn't have been clunking they couldn't have been clunking

Interrogative form

Simple form	V-ing form
could I clunk? could you clunk? could he clunk? could we clunk? could you clunk? could they clunk?	could I be clunking? could you be clunking? could he be clunking? could we be clunking? could you be clunking? could they be clunking?
Perfect	V-ing perfect
could I have clunked? could you have clunked? could he have clunked? could we have clunked? could you have clunked? could they have clunked?	could I have been clunking? could you have been clunking? could he have been clunking? could we have been clunking? could you have been clunking? could they have been clunking?

Interro-negative form

Simple form	V-ing form
couldn't I clunk? couldn't you clunk? couldn't he clunk? couldn't we clunk? couldn't you clunk? couldn't they clunk?	couldn't I be clunking? couldn't you be clunking? couldn't he be clunking? couldn't we be clunking? couldn't you be clunking? couldn't they be clunking?
Perfect	V-ing perfect
couldn't I have clunked? couldn't you have clunked? couldn't he have clunked? couldn't we have clunked? couldn't you have clunked? couldn't they have clunked?	couldn't I have been clunking? couldn't you have been clunking? couldn't he have been clunking? couldn't we have been clunking? couldn't you have been clunking? couldn't they have been clunking?