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