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