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