could paper-train
Regular verb: paper-train - paper-trained- paper-trained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could paper-train
you could paper-train
he could paper-train
we could paper-train
you could paper-train
they could paper-train 	I could be paper-training
you could be paper-training
he could be paper-training
we could be paper-training
you could be paper-training
they could be paper-training	I could have paper-trained
you could have paper-trained
he could have paper-trained
we could have paper-trained
you could have paper-trained
they could have paper-trained	I could have been paper-training
you could have been paper-training
he could have been paper-training
we could have been paper-training
you could have been paper-training
they could have been paper-training	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't paper-train
you couldn't paper-train
he couldn't paper-train
we couldn't paper-train
you couldn't paper-train
they couldn't paper-train 	I couldn't be paper-training
you couldn't be paper-training
he couldn't be paper-training
we couldn't be paper-training
you couldn't be paper-training
they couldn't be paper-training	I couldn't have paper-trained
you couldn't have paper-trained
he couldn't have paper-trained
we couldn't have paper-trained
you couldn't have paper-trained
they couldn't have paper-trained	I couldn't have been paper-training
you couldn't have been paper-training
he couldn't have been paper-training
we couldn't have been paper-training
you couldn't have been paper-training
they couldn't have been paper-training	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I paper-train?
could you paper-train?
could he paper-train?
could we paper-train?
could you paper-train?
could they paper-train? 	could I be paper-training?
could you be paper-training?
could he be paper-training?
could we be paper-training?
could you be paper-training?
could they be paper-training? 	could I have paper-trained?
could you have paper-trained?
could he have paper-trained?
could we have paper-trained?
could you have paper-trained?
could they have paper-trained? 	could I have been paper-training?
could you have been paper-training?
could he have been paper-training?
could we have been paper-training?
could you have been paper-training?
could they have been paper-training? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I paper-train?
couldn't you paper-train?
couldn't he paper-train?
couldn't we paper-train?
couldn't you paper-train?
couldn't they paper-train? 	couldn't I be paper-training?
couldn't you be paper-training?
couldn't he be paper-training?
couldn't we be paper-training?
couldn't you be paper-training?
couldn't they be paper-training? 	couldn't I have paper-trained?
couldn't you have paper-trained?
couldn't he have paper-trained?
couldn't we have paper-trained?
couldn't you have paper-trained?
couldn't they have paper-trained? 	couldn't I have been paper-training?
couldn't you have been paper-training?
couldn't he have been paper-training?
couldn't we have been paper-training?
couldn't you have been paper-training?
couldn't they have been paper-training?