could lesson
Verbo regular: lesson - lessoned- lessoned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could lesson
you could lesson
he could lesson
we could lesson
you could lesson
they could lesson 	I could be lessoning
you could be lessoning
he could be lessoning
we could be lessoning
you could be lessoning
they could be lessoning	I could have lessoned
you could have lessoned
he could have lessoned
we could have lessoned
you could have lessoned
they could have lessoned	I could have been lessoning
you could have been lessoning
he could have been lessoning
we could have been lessoning
you could have been lessoning
they could have been lessoning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not lesson
you could not lesson
he could not lesson
we could not lesson
you could not lesson
they could not lesson 	I could not be lessoning
you could not be lessoning
he could not be lessoning
we could not be lessoning
you could not be lessoning
they could not be lessoning	I could not have lessoned
you could not have lessoned
he could not have lessoned
we could not have lessoned
you could not have lessoned
they could not have lessoned	I could not have been lessoning
you could not have been lessoning
he could not have been lessoning
we could not have been lessoning
you could not have been lessoning
they could not have been lessoning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I lesson?
could you lesson?
could he lesson?
could we lesson?
could you lesson?
could they lesson? 	could I be lessoning?
could you be lessoning?
could he be lessoning?
could we be lessoning?
could you be lessoning?
could they be lessoning? 	could I have lessoned?
could you have lessoned?
could he have lessoned?
could we have lessoned?
could you have lessoned?
could they have lessoned? 	could I have been lessoning?
could you have been lessoning?
could he have been lessoning?
could we have been lessoning?
could you have been lessoning?
could they have been lessoning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not lesson?
could you not lesson?
could he not lesson?
could we not lesson?
could you not lesson?
could they not lesson? 	could I not be lessoning?
could you not be lessoning?
could he not be lessoning?
could we not be lessoning?
could you not be lessoning?
could they not be lessoning? 	could I not have lessoned?
could you not have lessoned?
could he not have lessoned?
could we not have lessoned?
could you not have lessoned?
could they not have lessoned? 	could I not have been lessoning?
could you not have been lessoning?
could he not have been lessoning?
could we not have been lessoning?
could you not have been lessoning?
could they not have been lessoning?