English verb conjugation
COULD TRAIN

Regular verb: train - trained - trained

Affirmation

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

Interrogative form

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