I could voyage you could voyage she could voyage we could voyage you could voyage they could voyage
V-ing form
I could be voyaging you could be voyaging she could be voyaging we could be voyaging you could be voyaging they could be voyaging
Perfect
I could have voyaged you could have voyaged she could have voyaged we could have voyaged you could have voyaged they could have voyaged
V-ing perfect
I could have been voyaging you could have been voyaging she could have been voyaging we could have been voyaging you could have been voyaging they could have been voyaging
Negation
Simple form
I couldn't voyage you couldn't voyage she couldn't voyage we couldn't voyage you couldn't voyage they couldn't voyage
V-ing form
I couldn't be voyaging you couldn't be voyaging she couldn't be voyaging we couldn't be voyaging you couldn't be voyaging they couldn't be voyaging
Perfect
I couldn't have voyaged you couldn't have voyaged she couldn't have voyaged we couldn't have voyaged you couldn't have voyaged they couldn't have voyaged
V-ing perfect
I couldn't have been voyaging you couldn't have been voyaging she couldn't have been voyaging we couldn't have been voyaging you couldn't have been voyaging they couldn't have been voyaging
Interrogative form
Simple form
could I voyage? could you voyage? could she voyage? could we voyage? could you voyage? could they voyage?
V-ing form
could I be voyaging? could you be voyaging? could she be voyaging? could we be voyaging? could you be voyaging? could they be voyaging?
Perfect
could I have voyaged? could you have voyaged? could she have voyaged? could we have voyaged? could you have voyaged? could they have voyaged?
V-ing perfect
could I have been voyaging? could you have been voyaging? could she have been voyaging? could we have been voyaging? could you have been voyaging? could they have been voyaging?
Interro-negative form
Simple form
couldn't I voyage? couldn't you voyage? couldn't she voyage? couldn't we voyage? couldn't you voyage? couldn't they voyage?
V-ing form
couldn't I be voyaging? couldn't you be voyaging? couldn't she be voyaging? couldn't we be voyaging? couldn't you be voyaging? couldn't they be voyaging?
Perfect
couldn't I have voyaged? couldn't you have voyaged? couldn't she have voyaged? couldn't we have voyaged? couldn't you have voyaged? couldn't they have voyaged?
V-ing perfect
couldn't I have been voyaging? couldn't you have been voyaging? couldn't she have been voyaging? couldn't we have been voyaging? couldn't you have been voyaging? couldn't they have been voyaging?