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

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not ad-lib
you could not ad-lib
he could not ad-lib
we could not ad-lib
you could not ad-lib
they could not ad-lib 	I could not be ad-libing
you could not be ad-libing
he could not be ad-libing
we could not be ad-libing
you could not be ad-libing
they could not be ad-libing	I could not have ad-libed
you could not have ad-libed
he could not have ad-libed
we could not have ad-libed
you could not have ad-libed
they could not have ad-libed	I could not have been ad-libing
you could not have been ad-libing
he could not have been ad-libing
we could not have been ad-libing
you could not have been ad-libing
they could not have been ad-libing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not ad-lib?
could you not ad-lib?
could he not ad-lib?
could we not ad-lib?
could you not ad-lib?
could they not ad-lib? 	could I not be ad-libing?
could you not be ad-libing?
could he not be ad-libing?
could we not be ad-libing?
could you not be ad-libing?
could they not be ad-libing? 	could I not have ad-libed?
could you not have ad-libed?
could he not have ad-libed?
could we not have ad-libed?
could you not have ad-libed?
could they not have ad-libed? 	could I not have been ad-libing?
could you not have been ad-libing?
could he not have been ad-libing?
could we not have been ad-libing?
could you not have been ad-libing?
could they not have been ad-libing?