English verb conjugation
COULD PAPER-TRAIN

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

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?