I could commute you could commute he could commute we could commute you could commute they could commute
V-ing form
I could be commuting you could be commuting he could be commuting we could be commuting you could be commuting they could be commuting
Perfect
I could have commuted you could have commuted he could have commuted we could have commuted you could have commuted they could have commuted
V-ing perfect
I could have been commuting you could have been commuting he could have been commuting we could have been commuting you could have been commuting they could have been commuting
Negation
Simple form
I couldn't commute you couldn't commute he couldn't commute we couldn't commute you couldn't commute they couldn't commute
V-ing form
I couldn't be commuting you couldn't be commuting he couldn't be commuting we couldn't be commuting you couldn't be commuting they couldn't be commuting
Perfect
I couldn't have commuted you couldn't have commuted he couldn't have commuted we couldn't have commuted you couldn't have commuted they couldn't have commuted
V-ing perfect
I couldn't have been commuting you couldn't have been commuting he couldn't have been commuting we couldn't have been commuting you couldn't have been commuting they couldn't have been commuting
Interrogative form
Simple form
could I commute? could you commute? could he commute? could we commute? could you commute? could they commute?
V-ing form
could I be commuting? could you be commuting? could he be commuting? could we be commuting? could you be commuting? could they be commuting?
Perfect
could I have commuted? could you have commuted? could he have commuted? could we have commuted? could you have commuted? could they have commuted?
V-ing perfect
could I have been commuting? could you have been commuting? could he have been commuting? could we have been commuting? could you have been commuting? could they have been commuting?
Interro-negative form
Simple form
couldn't I commute? couldn't you commute? couldn't he commute? couldn't we commute? couldn't you commute? couldn't they commute?
V-ing form
couldn't I be commuting? couldn't you be commuting? couldn't he be commuting? couldn't we be commuting? couldn't you be commuting? couldn't they be commuting?
Perfect
couldn't I have commuted? couldn't you have commuted? couldn't he have commuted? couldn't we have commuted? couldn't you have commuted? couldn't they have commuted?
V-ing perfect
couldn't I have been commuting? couldn't you have been commuting? couldn't he have been commuting? couldn't we have been commuting? couldn't you have been commuting? couldn't they have been commuting?