could improvise
Verbo regular: improvise - improvised- improvised

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could improvise
you could improvise
he could improvise
we could improvise
you could improvise
they could improvise 	I could be improvising
you could be improvising
he could be improvising
we could be improvising
you could be improvising
they could be improvising	I could have improvised
you could have improvised
he could have improvised
we could have improvised
you could have improvised
they could have improvised	I could have been improvising
you could have been improvising
he could have been improvising
we could have been improvising
you could have been improvising
they could have been improvising	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't improvise
you couldn't improvise
he couldn't improvise
we couldn't improvise
you couldn't improvise
they couldn't improvise 	I couldn't be improvising
you couldn't be improvising
he couldn't be improvising
we couldn't be improvising
you couldn't be improvising
they couldn't be improvising	I couldn't have improvised
you couldn't have improvised
he couldn't have improvised
we couldn't have improvised
you couldn't have improvised
they couldn't have improvised	I couldn't have been improvising
you couldn't have been improvising
he couldn't have been improvising
we couldn't have been improvising
you couldn't have been improvising
they couldn't have been improvising	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I improvise?
could you improvise?
could he improvise?
could we improvise?
could you improvise?
could they improvise? 	could I be improvising?
could you be improvising?
could he be improvising?
could we be improvising?
could you be improvising?
could they be improvising? 	could I have improvised?
could you have improvised?
could he have improvised?
could we have improvised?
could you have improvised?
could they have improvised? 	could I have been improvising?
could you have been improvising?
could he have been improvising?
could we have been improvising?
could you have been improvising?
could they have been improvising? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I improvise?
couldn't you improvise?
couldn't he improvise?
couldn't we improvise?
couldn't you improvise?
couldn't they improvise? 	couldn't I be improvising?
couldn't you be improvising?
couldn't he be improvising?
couldn't we be improvising?
couldn't you be improvising?
couldn't they be improvising? 	couldn't I have improvised?
couldn't you have improvised?
couldn't he have improvised?
couldn't we have improvised?
couldn't you have improvised?
couldn't they have improvised? 	couldn't I have been improvising?
couldn't you have been improvising?
couldn't he have been improvising?
couldn't we have been improvising?
couldn't you have been improvising?
couldn't they have been improvising?