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