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