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