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