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