could ad-lib
Verbo regular: ad-lib - ad-libed- ad-libed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could ad-lib
you could ad-lib
he could ad-lib
we could ad-lib
you could ad-lib
they could ad-lib 	I could be ad-libing
you could be ad-libing
he could be ad-libing
we could be ad-libing
you could be ad-libing
they could be ad-libing	I could have ad-libed
you could have ad-libed
he could have ad-libed
we could have ad-libed
you could have ad-libed
they could have ad-libed	I could have been ad-libing
you could have been ad-libing
he could have been ad-libing
we could have been ad-libing
you could have been ad-libing
they could have been ad-libing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't ad-lib
you couldn't ad-lib
he couldn't ad-lib
we couldn't ad-lib
you couldn't ad-lib
they couldn't ad-lib 	I couldn't be ad-libing
you couldn't be ad-libing
he couldn't be ad-libing
we couldn't be ad-libing
you couldn't be ad-libing
they couldn't be ad-libing	I couldn't have ad-libed
you couldn't have ad-libed
he couldn't have ad-libed
we couldn't have ad-libed
you couldn't have ad-libed
they couldn't have ad-libed	I couldn't have been ad-libing
you couldn't have been ad-libing
he couldn't have been ad-libing
we couldn't have been ad-libing
you couldn't have been ad-libing
they couldn't have been ad-libing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I ad-lib?
could you ad-lib?
could he ad-lib?
could we ad-lib?
could you ad-lib?
could they ad-lib? 	could I be ad-libing?
could you be ad-libing?
could he be ad-libing?
could we be ad-libing?
could you be ad-libing?
could they be ad-libing? 	could I have ad-libed?
could you have ad-libed?
could he have ad-libed?
could we have ad-libed?
could you have ad-libed?
could they have ad-libed? 	could I have been ad-libing?
could you have been ad-libing?
could he have been ad-libing?
could we have been ad-libing?
could you have been ad-libing?
could they have been ad-libing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I ad-lib?
couldn't you ad-lib?
couldn't he ad-lib?
couldn't we ad-lib?
couldn't you ad-lib?
couldn't they ad-lib? 	couldn't I be ad-libing?
couldn't you be ad-libing?
couldn't he be ad-libing?
couldn't we be ad-libing?
couldn't you be ad-libing?
couldn't they be ad-libing? 	couldn't I have ad-libed?
couldn't you have ad-libed?
couldn't he have ad-libed?
couldn't we have ad-libed?
couldn't you have ad-libed?
couldn't they have ad-libed? 	couldn't I have been ad-libing?
couldn't you have been ad-libing?
couldn't he have been ad-libing?
couldn't we have been ad-libing?
couldn't you have been ad-libing?
couldn't they have been ad-libing?