could navigate
Verbo regular: navigate - navigated- navigated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could navigate
you could navigate
he could navigate
we could navigate
you could navigate
they could navigate 	I could be navigating
you could be navigating
he could be navigating
we could be navigating
you could be navigating
they could be navigating	I could have navigated
you could have navigated
he could have navigated
we could have navigated
you could have navigated
they could have navigated	I could have been navigating
you could have been navigating
he could have been navigating
we could have been navigating
you could have been navigating
they could have been navigating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not navigate
you could not navigate
he could not navigate
we could not navigate
you could not navigate
they could not navigate 	I could not be navigating
you could not be navigating
he could not be navigating
we could not be navigating
you could not be navigating
they could not be navigating	I could not have navigated
you could not have navigated
he could not have navigated
we could not have navigated
you could not have navigated
they could not have navigated	I could not have been navigating
you could not have been navigating
he could not have been navigating
we could not have been navigating
you could not have been navigating
they could not have been navigating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I navigate?
could you navigate?
could he navigate?
could we navigate?
could you navigate?
could they navigate? 	could I be navigating?
could you be navigating?
could he be navigating?
could we be navigating?
could you be navigating?
could they be navigating? 	could I have navigated?
could you have navigated?
could he have navigated?
could we have navigated?
could you have navigated?
could they have navigated? 	could I have been navigating?
could you have been navigating?
could he have been navigating?
could we have been navigating?
could you have been navigating?
could they have been navigating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not navigate?
could you not navigate?
could he not navigate?
could we not navigate?
could you not navigate?
could they not navigate? 	could I not be navigating?
could you not be navigating?
could he not be navigating?
could we not be navigating?
could you not be navigating?
could they not be navigating? 	could I not have navigated?
could you not have navigated?
could he not have navigated?
could we not have navigated?
could you not have navigated?
could they not have navigated? 	could I not have been navigating?
could you not have been navigating?
could he not have been navigating?
could we not have been navigating?
could you not have been navigating?
could they not have been navigating?