could program
Verbo regular: program - programmed- programmed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could program
you could program
he could program
we could program
you could program
they could program 	I could be programming
you could be programming
he could be programming
we could be programming
you could be programming
they could be programming	I could have programmed
you could have programmed
he could have programmed
we could have programmed
you could have programmed
they could have programmed	I could have been programming
you could have been programming
he could have been programming
we could have been programming
you could have been programming
they could have been programming	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't program
you couldn't program
he couldn't program
we couldn't program
you couldn't program
they couldn't program 	I couldn't be programming
you couldn't be programming
he couldn't be programming
we couldn't be programming
you couldn't be programming
they couldn't be programming	I couldn't have programmed
you couldn't have programmed
he couldn't have programmed
we couldn't have programmed
you couldn't have programmed
they couldn't have programmed	I couldn't have been programming
you couldn't have been programming
he couldn't have been programming
we couldn't have been programming
you couldn't have been programming
they couldn't have been programming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I program?
could you program?
could he program?
could we program?
could you program?
could they program? 	could I be programming?
could you be programming?
could he be programming?
could we be programming?
could you be programming?
could they be programming? 	could I have programmed?
could you have programmed?
could he have programmed?
could we have programmed?
could you have programmed?
could they have programmed? 	could I have been programming?
could you have been programming?
could he have been programming?
could we have been programming?
could you have been programming?
could they have been programming? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I program?
couldn't you program?
couldn't he program?
couldn't we program?
couldn't you program?
couldn't they program? 	couldn't I be programming?
couldn't you be programming?
couldn't he be programming?
couldn't we be programming?
couldn't you be programming?
couldn't they be programming? 	couldn't I have programmed?
couldn't you have programmed?
couldn't he have programmed?
couldn't we have programmed?
couldn't you have programmed?
couldn't they have programmed? 	couldn't I have been programming?
couldn't you have been programming?
couldn't he have been programming?
couldn't we have been programming?
couldn't you have been programming?
couldn't they have been programming?