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