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