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