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
she 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
she 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
she 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
she 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 could not paper-train
you could not paper-train
she could not paper-train
we could not paper-train
you could not paper-train
they could not paper-train 	I could not be paper-training
you could not be paper-training
she could not be paper-training
we could not be paper-training
you could not be paper-training
they could not be paper-training	I could not have paper-trained
you could not have paper-trained
she could not have paper-trained
we could not have paper-trained
you could not have paper-trained
they could not have paper-trained	I could not have been paper-training
you could not have been paper-training
she could not have been paper-training
we could not have been paper-training
you could not have been paper-training
they could not have been paper-training	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I paper-train?
could you paper-train?
could she 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 she 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 she 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 she 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 	
could I not paper-train?
could you not paper-train?
could she not paper-train?
could we not paper-train?
could you not paper-train?
could they not paper-train? 	could I not be paper-training?
could you not be paper-training?
could she not be paper-training?
could we not be paper-training?
could you not be paper-training?
could they not be paper-training? 	could I not have paper-trained?
could you not have paper-trained?
could she not have paper-trained?
could we not have paper-trained?
could you not have paper-trained?
could they not have paper-trained? 	could I not have been paper-training?
could you not have been paper-training?
could she not have been paper-training?
could we not have been paper-training?
could you not have been paper-training?
could they not have been paper-training?