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