I could travel you could travel she could travel we could travel you could travel they could travel
Forma con V-ing
I could be travelling you could be travelling she could be travelling we could be travelling you could be travelling they could be travelling
Perfecto
I could have travelled you could have travelled she could have travelled we could have travelled you could have travelled they could have travelled
Perfecto con V-ing
I could have been travelling you could have been travelling she could have been travelling we could have been travelling you could have been travelling they could have been travelling
Negación
Forma simple
I could not travel you could not travel she could not travel we could not travel you could not travel they could not travel
Forma con V-ing
I could not be travelling you could not be travelling she could not be travelling we could not be travelling you could not be travelling they could not be travelling
Perfecto
I could not have travelled you could not have travelled she could not have travelled we could not have travelled you could not have travelled they could not have travelled
Perfecto con V-ing
I could not have been travelling you could not have been travelling she could not have been travelling we could not have been travelling you could not have been travelling they could not have been travelling
Forma interrogativa
Forma simple
could I travel? could you travel? could she travel? could we travel? could you travel? could they travel?
Forma con V-ing
could I be travelling? could you be travelling? could she be travelling? could we be travelling? could you be travelling? could they be travelling?
Perfecto
could I have travelled? could you have travelled? could she have travelled? could we have travelled? could you have travelled? could they have travelled?
Perfecto con V-ing
could I have been travelling? could you have been travelling? could she have been travelling? could we have been travelling? could you have been travelling? could they have been travelling?
Forma interro-negativa
Forma simple
could I not travel? could you not travel? could she not travel? could we not travel? could you not travel? could they not travel?
Forma con V-ing
could I not be travelling? could you not be travelling? could she not be travelling? could we not be travelling? could you not be travelling? could they not be travelling?
Perfecto
could I not have travelled? could you not have travelled? could she not have travelled? could we not have travelled? could you not have travelled? could they not have travelled?
Perfecto con V-ing
could I not have been travelling? could you not have been travelling? could she not have been travelling? could we not have been travelling? could you not have been travelling? could they not have been travelling?