could excavate
Verbo regular: excavate - excavated- excavated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could excavate
you could excavate
he could excavate
we could excavate
you could excavate
they could excavate 	I could be excavating
you could be excavating
he could be excavating
we could be excavating
you could be excavating
they could be excavating	I could have excavated
you could have excavated
he could have excavated
we could have excavated
you could have excavated
they could have excavated	I could have been excavating
you could have been excavating
he could have been excavating
we could have been excavating
you could have been excavating
they could have been excavating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not excavate
you could not excavate
he could not excavate
we could not excavate
you could not excavate
they could not excavate 	I could not be excavating
you could not be excavating
he could not be excavating
we could not be excavating
you could not be excavating
they could not be excavating	I could not have excavated
you could not have excavated
he could not have excavated
we could not have excavated
you could not have excavated
they could not have excavated	I could not have been excavating
you could not have been excavating
he could not have been excavating
we could not have been excavating
you could not have been excavating
they could not have been excavating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I excavate?
could you excavate?
could he excavate?
could we excavate?
could you excavate?
could they excavate? 	could I be excavating?
could you be excavating?
could he be excavating?
could we be excavating?
could you be excavating?
could they be excavating? 	could I have excavated?
could you have excavated?
could he have excavated?
could we have excavated?
could you have excavated?
could they have excavated? 	could I have been excavating?
could you have been excavating?
could he have been excavating?
could we have been excavating?
could you have been excavating?
could they have been excavating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not excavate?
could you not excavate?
could he not excavate?
could we not excavate?
could you not excavate?
could they not excavate? 	could I not be excavating?
could you not be excavating?
could he not be excavating?
could we not be excavating?
could you not be excavating?
could they not be excavating? 	could I not have excavated?
could you not have excavated?
could he not have excavated?
could we not have excavated?
could you not have excavated?
could they not have excavated? 	could I not have been excavating?
could you not have been excavating?
could he not have been excavating?
could we not have been excavating?
could you not have been excavating?
could they not have been excavating?