could cavern
Verbo regular: cavern - caverned- caverned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could cavern
you could cavern
she could cavern
we could cavern
you could cavern
they could cavern 	I could be caverning
you could be caverning
she could be caverning
we could be caverning
you could be caverning
they could be caverning	I could have caverned
you could have caverned
she could have caverned
we could have caverned
you could have caverned
they could have caverned	I could have been caverning
you could have been caverning
she could have been caverning
we could have been caverning
you could have been caverning
they could have been caverning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not cavern
you could not cavern
she could not cavern
we could not cavern
you could not cavern
they could not cavern 	I could not be caverning
you could not be caverning
she could not be caverning
we could not be caverning
you could not be caverning
they could not be caverning	I could not have caverned
you could not have caverned
she could not have caverned
we could not have caverned
you could not have caverned
they could not have caverned	I could not have been caverning
you could not have been caverning
she could not have been caverning
we could not have been caverning
you could not have been caverning
they could not have been caverning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I cavern?
could you cavern?
could she cavern?
could we cavern?
could you cavern?
could they cavern? 	could I be caverning?
could you be caverning?
could she be caverning?
could we be caverning?
could you be caverning?
could they be caverning? 	could I have caverned?
could you have caverned?
could she have caverned?
could we have caverned?
could you have caverned?
could they have caverned? 	could I have been caverning?
could you have been caverning?
could she have been caverning?
could we have been caverning?
could you have been caverning?
could they have been caverning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not cavern?
could you not cavern?
could she not cavern?
could we not cavern?
could you not cavern?
could they not cavern? 	could I not be caverning?
could you not be caverning?
could she not be caverning?
could we not be caverning?
could you not be caverning?
could they not be caverning? 	could I not have caverned?
could you not have caverned?
could she not have caverned?
could we not have caverned?
could you not have caverned?
could they not have caverned? 	could I not have been caverning?
could you not have been caverning?
could she not have been caverning?
could we not have been caverning?
could you not have been caverning?
could they not have been caverning?