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