could tan
Verbo regular: tan - tanned- tanned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could tan
you could tan
he could tan
we could tan
you could tan
they could tan 	I could be tanning
you could be tanning
he could be tanning
we could be tanning
you could be tanning
they could be tanning	I could have tanned
you could have tanned
he could have tanned
we could have tanned
you could have tanned
they could have tanned	I could have been tanning
you could have been tanning
he could have been tanning
we could have been tanning
you could have been tanning
they could have been tanning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't tan
you couldn't tan
he couldn't tan
we couldn't tan
you couldn't tan
they couldn't tan 	I couldn't be tanning
you couldn't be tanning
he couldn't be tanning
we couldn't be tanning
you couldn't be tanning
they couldn't be tanning	I couldn't have tanned
you couldn't have tanned
he couldn't have tanned
we couldn't have tanned
you couldn't have tanned
they couldn't have tanned	I couldn't have been tanning
you couldn't have been tanning
he couldn't have been tanning
we couldn't have been tanning
you couldn't have been tanning
they couldn't have been tanning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I tan?
could you tan?
could he tan?
could we tan?
could you tan?
could they tan? 	could I be tanning?
could you be tanning?
could he be tanning?
could we be tanning?
could you be tanning?
could they be tanning? 	could I have tanned?
could you have tanned?
could he have tanned?
could we have tanned?
could you have tanned?
could they have tanned? 	could I have been tanning?
could you have been tanning?
could he have been tanning?
could we have been tanning?
could you have been tanning?
could they have been tanning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I tan?
couldn't you tan?
couldn't he tan?
couldn't we tan?
couldn't you tan?
couldn't they tan? 	couldn't I be tanning?
couldn't you be tanning?
couldn't he be tanning?
couldn't we be tanning?
couldn't you be tanning?
couldn't they be tanning? 	couldn't I have tanned?
couldn't you have tanned?
couldn't he have tanned?
couldn't we have tanned?
couldn't you have tanned?
couldn't they have tanned? 	couldn't I have been tanning?
couldn't you have been tanning?
couldn't he have been tanning?
couldn't we have been tanning?
couldn't you have been tanning?
couldn't they have been tanning?