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