English verb conjugation
COULD THUNK

Regular verb: thunk - thunked - thunked

Affirmation

Simple form	V-ing form
I could thunk you could thunk he could thunk we could thunk you could thunk they could thunk	I could be thunking you could be thunking he could be thunking we could be thunking you could be thunking they could be thunking
Perfect	V-ing perfect
I could have thunked you could have thunked he could have thunked we could have thunked you could have thunked they could have thunked	I could have been thunking you could have been thunking he could have been thunking we could have been thunking you could have been thunking they could have been thunking

Negation

Simple form	V-ing form
I couldn't thunk you couldn't thunk he couldn't thunk we couldn't thunk you couldn't thunk they couldn't thunk	I couldn't be thunking you couldn't be thunking he couldn't be thunking we couldn't be thunking you couldn't be thunking they couldn't be thunking
Perfect	V-ing perfect
I couldn't have thunked you couldn't have thunked he couldn't have thunked we couldn't have thunked you couldn't have thunked they couldn't have thunked	I couldn't have been thunking you couldn't have been thunking he couldn't have been thunking we couldn't have been thunking you couldn't have been thunking they couldn't have been thunking

Interrogative form

Simple form	V-ing form
could I thunk? could you thunk? could he thunk? could we thunk? could you thunk? could they thunk?	could I be thunking? could you be thunking? could he be thunking? could we be thunking? could you be thunking? could they be thunking?
Perfect	V-ing perfect
could I have thunked? could you have thunked? could he have thunked? could we have thunked? could you have thunked? could they have thunked?	could I have been thunking? could you have been thunking? could he have been thunking? could we have been thunking? could you have been thunking? could they have been thunking?

Interro-negative form

Simple form	V-ing form
couldn't I thunk? couldn't you thunk? couldn't he thunk? couldn't we thunk? couldn't you thunk? couldn't they thunk?	couldn't I be thunking? couldn't you be thunking? couldn't he be thunking? couldn't we be thunking? couldn't you be thunking? couldn't they be thunking?
Perfect	V-ing perfect
couldn't I have thunked? couldn't you have thunked? couldn't he have thunked? couldn't we have thunked? couldn't you have thunked? couldn't they have thunked?	couldn't I have been thunking? couldn't you have been thunking? couldn't he have been thunking? couldn't we have been thunking? couldn't you have been thunking? couldn't they have been thunking?