I could commute you could commute she could commute we could commute you could commute they could commute
V-ing form
I could be commuting you could be commuting she could be commuting we could be commuting you could be commuting they could be commuting
Perfect
I could have commuted you could have commuted she 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 she 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 she 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 she 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 she 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 she 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 she commute? could we commute? could you commute? could they commute?
V-ing form
could I be commuting? could you be commuting? could she be commuting? could we be commuting? could you be commuting? could they be commuting?
Perfect
could I have commuted? could you have commuted? could she 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 she 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 she 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 she 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 she 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 she have been commuting? couldn't we have been commuting? couldn't you have been commuting? couldn't they have been commuting?