could drill
Verbo regular: drill - drilled- drilled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could drill
you could drill
he could drill
we could drill
you could drill
they could drill 	I could be drilling
you could be drilling
he could be drilling
we could be drilling
you could be drilling
they could be drilling	I could have drilled
you could have drilled
he could have drilled
we could have drilled
you could have drilled
they could have drilled	I could have been drilling
you could have been drilling
he could have been drilling
we could have been drilling
you could have been drilling
they could have been drilling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not drill
you could not drill
he could not drill
we could not drill
you could not drill
they could not drill 	I could not be drilling
you could not be drilling
he could not be drilling
we could not be drilling
you could not be drilling
they could not be drilling	I could not have drilled
you could not have drilled
he could not have drilled
we could not have drilled
you could not have drilled
they could not have drilled	I could not have been drilling
you could not have been drilling
he could not have been drilling
we could not have been drilling
you could not have been drilling
they could not have been drilling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I drill?
could you drill?
could he drill?
could we drill?
could you drill?
could they drill? 	could I be drilling?
could you be drilling?
could he be drilling?
could we be drilling?
could you be drilling?
could they be drilling? 	could I have drilled?
could you have drilled?
could he have drilled?
could we have drilled?
could you have drilled?
could they have drilled? 	could I have been drilling?
could you have been drilling?
could he have been drilling?
could we have been drilling?
could you have been drilling?
could they have been drilling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not drill?
could you not drill?
could he not drill?
could we not drill?
could you not drill?
could they not drill? 	could I not be drilling?
could you not be drilling?
could he not be drilling?
could we not be drilling?
could you not be drilling?
could they not be drilling? 	could I not have drilled?
could you not have drilled?
could he not have drilled?
could we not have drilled?
could you not have drilled?
could they not have drilled? 	could I not have been drilling?
could you not have been drilling?
could he not have been drilling?
could we not have been drilling?
could you not have been drilling?
could they not have been drilling?