I could interpose you could interpose she could interpose we could interpose you could interpose they could interpose
V-ing form
I could be interposing you could be interposing she could be interposing we could be interposing you could be interposing they could be interposing
Perfect
I could have interposed you could have interposed she could have interposed we could have interposed you could have interposed they could have interposed
V-ing perfect
I could have been interposing you could have been interposing she could have been interposing we could have been interposing you could have been interposing they could have been interposing
Negation
Simple form
I couldn't interpose you couldn't interpose she couldn't interpose we couldn't interpose you couldn't interpose they couldn't interpose
V-ing form
I couldn't be interposing you couldn't be interposing she couldn't be interposing we couldn't be interposing you couldn't be interposing they couldn't be interposing
Perfect
I couldn't have interposed you couldn't have interposed she couldn't have interposed we couldn't have interposed you couldn't have interposed they couldn't have interposed
V-ing perfect
I couldn't have been interposing you couldn't have been interposing she couldn't have been interposing we couldn't have been interposing you couldn't have been interposing they couldn't have been interposing
Interrogative form
Simple form
could I interpose? could you interpose? could she interpose? could we interpose? could you interpose? could they interpose?
V-ing form
could I be interposing? could you be interposing? could she be interposing? could we be interposing? could you be interposing? could they be interposing?
Perfect
could I have interposed? could you have interposed? could she have interposed? could we have interposed? could you have interposed? could they have interposed?
V-ing perfect
could I have been interposing? could you have been interposing? could she have been interposing? could we have been interposing? could you have been interposing? could they have been interposing?
Interro-negative form
Simple form
couldn't I interpose? couldn't you interpose? couldn't she interpose? couldn't we interpose? couldn't you interpose? couldn't they interpose?
V-ing form
couldn't I be interposing? couldn't you be interposing? couldn't she be interposing? couldn't we be interposing? couldn't you be interposing? couldn't they be interposing?
Perfect
couldn't I have interposed? couldn't you have interposed? couldn't she have interposed? couldn't we have interposed? couldn't you have interposed? couldn't they have interposed?
V-ing perfect
couldn't I have been interposing? couldn't you have been interposing? couldn't she have been interposing? couldn't we have been interposing? couldn't you have been interposing? couldn't they have been interposing?