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