could plank
Verbo regular: plank - planked- planked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could plank
you could plank
she could plank
we could plank
you could plank
they could plank 	I could be planking
you could be planking
she could be planking
we could be planking
you could be planking
they could be planking	I could have planked
you could have planked
she could have planked
we could have planked
you could have planked
they could have planked	I could have been planking
you could have been planking
she could have been planking
we could have been planking
you could have been planking
they could have been planking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't plank
you couldn't plank
she couldn't plank
we couldn't plank
you couldn't plank
they couldn't plank 	I couldn't be planking
you couldn't be planking
she couldn't be planking
we couldn't be planking
you couldn't be planking
they couldn't be planking	I couldn't have planked
you couldn't have planked
she couldn't have planked
we couldn't have planked
you couldn't have planked
they couldn't have planked	I couldn't have been planking
you couldn't have been planking
she couldn't have been planking
we couldn't have been planking
you couldn't have been planking
they couldn't have been planking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I plank?
could you plank?
could she plank?
could we plank?
could you plank?
could they plank? 	could I be planking?
could you be planking?
could she be planking?
could we be planking?
could you be planking?
could they be planking? 	could I have planked?
could you have planked?
could she have planked?
could we have planked?
could you have planked?
could they have planked? 	could I have been planking?
could you have been planking?
could she have been planking?
could we have been planking?
could you have been planking?
could they have been planking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I plank?
couldn't you plank?
couldn't she plank?
couldn't we plank?
couldn't you plank?
couldn't they plank? 	couldn't I be planking?
couldn't you be planking?
couldn't she be planking?
couldn't we be planking?
couldn't you be planking?
couldn't they be planking? 	couldn't I have planked?
couldn't you have planked?
couldn't she have planked?
couldn't we have planked?
couldn't you have planked?
couldn't they have planked? 	couldn't I have been planking?
couldn't you have been planking?
couldn't she have been planking?
couldn't we have been planking?
couldn't you have been planking?
couldn't they have been planking?