English verb conjugation
COULD TRAVEL

Regular verb: travel - travelled - travelled

Affirmation

Simple form	V-ing form
I could travel you could travel he could travel we could travel you could travel they could travel	I could be travelling you could be travelling he could be travelling we could be travelling you could be travelling they could be travelling
Perfect	V-ing perfect
I could have travelled you could have travelled he could have travelled we could have travelled you could have travelled they could have travelled	I could have been travelling you could have been travelling he could have been travelling we could have been travelling you could have been travelling they could have been travelling

Negation

Simple form	V-ing form
I could not travel you could not travel he could not travel we could not travel you could not travel they could not travel	I could not be travelling you could not be travelling he could not be travelling we could not be travelling you could not be travelling they could not be travelling
Perfect	V-ing perfect
I could not have travelled you could not have travelled he could not have travelled we could not have travelled you could not have travelled they could not have travelled	I could not have been travelling you could not have been travelling he could not have been travelling we could not have been travelling you could not have been travelling they could not have been travelling

Interrogative form

Simple form	V-ing form
could I travel? could you travel? could he travel? could we travel? could you travel? could they travel?	could I be travelling? could you be travelling? could he be travelling? could we be travelling? could you be travelling? could they be travelling?
Perfect	V-ing perfect
could I have travelled? could you have travelled? could he have travelled? could we have travelled? could you have travelled? could they have travelled?	could I have been travelling? could you have been travelling? could he have been travelling? could we have been travelling? could you have been travelling? could they have been travelling?

Interro-negative form

Simple form	V-ing form
could I not travel? could you not travel? could he not travel? could we not travel? could you not travel? could they not travel?	could I not be travelling? could you not be travelling? could he not be travelling? could we not be travelling? could you not be travelling? could they not be travelling?
Perfect	V-ing perfect
could I not have travelled? could you not have travelled? could he not have travelled? could we not have travelled? could you not have travelled? could they not have travelled?	could I not have been travelling? could you not have been travelling? could he not have been travelling? could we not have been travelling? could you not have been travelling? could they not have been travelling?