could train
Verbo regular: train - trained- trained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could train
you could train
he could train
we could train
you could train
they could train 	I could be training
you could be training
he could be training
we could be training
you could be training
they could be training	I could have trained
you could have trained
he could have trained
we could have trained
you could have trained
they could have trained	I could have been training
you could have been training
he could have been training
we could have been training
you could have been training
they could have been training	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't train
you couldn't train
he couldn't train
we couldn't train
you couldn't train
they couldn't train 	I couldn't be training
you couldn't be training
he couldn't be training
we couldn't be training
you couldn't be training
they couldn't be training	I couldn't have trained
you couldn't have trained
he couldn't have trained
we couldn't have trained
you couldn't have trained
they couldn't have trained	I couldn't have been training
you couldn't have been training
he couldn't have been training
we couldn't have been training
you couldn't have been training
they couldn't have been training	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I train?
could you train?
could he train?
could we train?
could you train?
could they train? 	could I be training?
could you be training?
could he be training?
could we be training?
could you be training?
could they be training? 	could I have trained?
could you have trained?
could he have trained?
could we have trained?
could you have trained?
could they have trained? 	could I have been training?
could you have been training?
could he have been training?
could we have been training?
could you have been training?
could they have been training? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I train?
couldn't you train?
couldn't he train?
couldn't we train?
couldn't you train?
couldn't they train? 	couldn't I be training?
couldn't you be training?
couldn't he be training?
couldn't we be training?
couldn't you be training?
couldn't they be training? 	couldn't I have trained?
couldn't you have trained?
couldn't he have trained?
couldn't we have trained?
couldn't you have trained?
couldn't they have trained? 	couldn't I have been training?
couldn't you have been training?
couldn't he have been training?
couldn't we have been training?
couldn't you have been training?
couldn't they have been training?