could lucubrate
Verbo regular: lucubrate - lucubrated- lucubrated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could lucubrate
you could lucubrate
he could lucubrate
we could lucubrate
you could lucubrate
they could lucubrate 	I could be lucubrating
you could be lucubrating
he could be lucubrating
we could be lucubrating
you could be lucubrating
they could be lucubrating	I could have lucubrated
you could have lucubrated
he could have lucubrated
we could have lucubrated
you could have lucubrated
they could have lucubrated	I could have been lucubrating
you could have been lucubrating
he could have been lucubrating
we could have been lucubrating
you could have been lucubrating
they could have been lucubrating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't lucubrate
you couldn't lucubrate
he couldn't lucubrate
we couldn't lucubrate
you couldn't lucubrate
they couldn't lucubrate 	I couldn't be lucubrating
you couldn't be lucubrating
he couldn't be lucubrating
we couldn't be lucubrating
you couldn't be lucubrating
they couldn't be lucubrating	I couldn't have lucubrated
you couldn't have lucubrated
he couldn't have lucubrated
we couldn't have lucubrated
you couldn't have lucubrated
they couldn't have lucubrated	I couldn't have been lucubrating
you couldn't have been lucubrating
he couldn't have been lucubrating
we couldn't have been lucubrating
you couldn't have been lucubrating
they couldn't have been lucubrating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I lucubrate?
could you lucubrate?
could he lucubrate?
could we lucubrate?
could you lucubrate?
could they lucubrate? 	could I be lucubrating?
could you be lucubrating?
could he be lucubrating?
could we be lucubrating?
could you be lucubrating?
could they be lucubrating? 	could I have lucubrated?
could you have lucubrated?
could he have lucubrated?
could we have lucubrated?
could you have lucubrated?
could they have lucubrated? 	could I have been lucubrating?
could you have been lucubrating?
could he have been lucubrating?
could we have been lucubrating?
could you have been lucubrating?
could they have been lucubrating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I lucubrate?
couldn't you lucubrate?
couldn't he lucubrate?
couldn't we lucubrate?
couldn't you lucubrate?
couldn't they lucubrate? 	couldn't I be lucubrating?
couldn't you be lucubrating?
couldn't he be lucubrating?
couldn't we be lucubrating?
couldn't you be lucubrating?
couldn't they be lucubrating? 	couldn't I have lucubrated?
couldn't you have lucubrated?
couldn't he have lucubrated?
couldn't we have lucubrated?
couldn't you have lucubrated?
couldn't they have lucubrated? 	couldn't I have been lucubrating?
couldn't you have been lucubrating?
couldn't he have been lucubrating?
couldn't we have been lucubrating?
couldn't you have been lucubrating?
couldn't they have been lucubrating?