can ad-lib
Regular verb: ad-lib - ad-libed- ad-libed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can ad-lib
you can ad-lib
he can ad-lib
we can ad-lib
you can ad-lib
they can ad-lib 	I can be ad-libing
you can be ad-libing
he can be ad-libing
we can be ad-libing
you can be ad-libing
they can be ad-libing	I can have ad-libed
you can have ad-libed
he can have ad-libed
we can have ad-libed
you can have ad-libed
they can have ad-libed	I can have been ad-libing
you can have been ad-libing
he can have been ad-libing
we can have been ad-libing
you can have been ad-libing
they can have been ad-libing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't ad-lib
you can't ad-lib
he can't ad-lib
we can't ad-lib
you can't ad-lib
they can't ad-lib 	I can't be ad-libing
you can't be ad-libing
he can't be ad-libing
we can't be ad-libing
you can't be ad-libing
they can't be ad-libing	I can't have ad-libed
you can't have ad-libed
he can't have ad-libed
we can't have ad-libed
you can't have ad-libed
they can't have ad-libed	I can't have been ad-libing
you can't have been ad-libing
he can't have been ad-libing
we can't have been ad-libing
you can't have been ad-libing
they can't have been ad-libing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I ad-lib?
can you ad-lib?
can he ad-lib?
can we ad-lib?
can you ad-lib?
can they ad-lib? 	can I be ad-libing?
can you be ad-libing?
can he be ad-libing?
can we be ad-libing?
can you be ad-libing?
can they be ad-libing? 	can I have ad-libed?
can you have ad-libed?
can he have ad-libed?
can we have ad-libed?
can you have ad-libed?
can they have ad-libed? 	can I have been ad-libing?
can you have been ad-libing?
can he have been ad-libing?
can we have been ad-libing?
can you have been ad-libing?
can they have been ad-libing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I ad-lib?
can't you ad-lib?
can't he ad-lib?
can't we ad-lib?
can't you ad-lib?
can't they ad-lib? 	can't I be ad-libing?
can't you be ad-libing?
can't he be ad-libing?
can't we be ad-libing?
can't you be ad-libing?
can't they be ad-libing? 	can't I have ad-libed?
can't you have ad-libed?
can't he have ad-libed?
can't we have ad-libed?
can't you have ad-libed?
can't they have ad-libed? 	can't I have been ad-libing?
can't you have been ad-libing?
can't he have been ad-libing?
can't we have been ad-libing?
can't you have been ad-libing?
can't they have been ad-libing?