I could hitchhike you could hitchhike he could hitchhike we could hitchhike you could hitchhike they could hitchhike
V-ing form
I could be hitchhiking you could be hitchhiking he could be hitchhiking we could be hitchhiking you could be hitchhiking they could be hitchhiking
Perfect
I could have hitchhiked you could have hitchhiked he could have hitchhiked we could have hitchhiked you could have hitchhiked they could have hitchhiked
V-ing perfect
I could have been hitchhiking you could have been hitchhiking he could have been hitchhiking we could have been hitchhiking you could have been hitchhiking they could have been hitchhiking
Negation
Simple form
I could not hitchhike you could not hitchhike he could not hitchhike we could not hitchhike you could not hitchhike they could not hitchhike
V-ing form
I could not be hitchhiking you could not be hitchhiking he could not be hitchhiking we could not be hitchhiking you could not be hitchhiking they could not be hitchhiking
Perfect
I could not have hitchhiked you could not have hitchhiked he could not have hitchhiked we could not have hitchhiked you could not have hitchhiked they could not have hitchhiked
V-ing perfect
I could not have been hitchhiking you could not have been hitchhiking he could not have been hitchhiking we could not have been hitchhiking you could not have been hitchhiking they could not have been hitchhiking
Interrogative form
Simple form
could I hitchhike? could you hitchhike? could he hitchhike? could we hitchhike? could you hitchhike? could they hitchhike?
V-ing form
could I be hitchhiking? could you be hitchhiking? could he be hitchhiking? could we be hitchhiking? could you be hitchhiking? could they be hitchhiking?
Perfect
could I have hitchhiked? could you have hitchhiked? could he have hitchhiked? could we have hitchhiked? could you have hitchhiked? could they have hitchhiked?
V-ing perfect
could I have been hitchhiking? could you have been hitchhiking? could he have been hitchhiking? could we have been hitchhiking? could you have been hitchhiking? could they have been hitchhiking?
Interro-negative form
Simple form
could I not hitchhike? could you not hitchhike? could he not hitchhike? could we not hitchhike? could you not hitchhike? could they not hitchhike?
V-ing form
could I not be hitchhiking? could you not be hitchhiking? could he not be hitchhiking? could we not be hitchhiking? could you not be hitchhiking? could they not be hitchhiking?
Perfect
could I not have hitchhiked? could you not have hitchhiked? could he not have hitchhiked? could we not have hitchhiked? could you not have hitchhiked? could they not have hitchhiked?
V-ing perfect
could I not have been hitchhiking? could you not have been hitchhiking? could he not have been hitchhiking? could we not have been hitchhiking? could you not have been hitchhiking? could they not have been hitchhiking?