could thunk
Verbo regular: thunk - thunked- thunked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could thunk
you could thunk
she could thunk
we could thunk
you could thunk
they could thunk 	I could be thunking
you could be thunking
she could be thunking
we could be thunking
you could be thunking
they could be thunking	I could have thunked
you could have thunked
she 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
she could have been thunking
we could have been thunking
you could have been thunking
they could have been thunking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not thunk
you could not thunk
she could not thunk
we could not thunk
you could not thunk
they could not thunk 	I could not be thunking
you could not be thunking
she could not be thunking
we could not be thunking
you could not be thunking
they could not be thunking	I could not have thunked
you could not have thunked
she could not have thunked
we could not have thunked
you could not have thunked
they could not have thunked	I could not have been thunking
you could not have been thunking
she could not have been thunking
we could not have been thunking
you could not have been thunking
they could not have been thunking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I thunk?
could you thunk?
could she thunk?
could we thunk?
could you thunk?
could they thunk? 	could I be thunking?
could you be thunking?
could she be thunking?
could we be thunking?
could you be thunking?
could they be thunking? 	could I have thunked?
could you have thunked?
could she 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 she have been thunking?
could we have been thunking?
could you have been thunking?
could they have been thunking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not thunk?
could you not thunk?
could she not thunk?
could we not thunk?
could you not thunk?
could they not thunk? 	could I not be thunking?
could you not be thunking?
could she not be thunking?
could we not be thunking?
could you not be thunking?
could they not be thunking? 	could I not have thunked?
could you not have thunked?
could she not have thunked?
could we not have thunked?
could you not have thunked?
could they not have thunked? 	could I not have been thunking?
could you not have been thunking?
could she not have been thunking?
could we not have been thunking?
could you not have been thunking?
could they not have been thunking?