English verb conjugation
COULD TRAIN

Regular verb: train - trained - trained

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

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

Interro-negative form

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