I could evaluate you could evaluate she could evaluate we could evaluate you could evaluate they could evaluate
V-ing form
I could be evaluating you could be evaluating she could be evaluating we could be evaluating you could be evaluating they could be evaluating
Perfect
I could have evaluated you could have evaluated she could have evaluated we could have evaluated you could have evaluated they could have evaluated
V-ing perfect
I could have been evaluating you could have been evaluating she could have been evaluating we could have been evaluating you could have been evaluating they could have been evaluating
Negation
Simple form
I could not evaluate you could not evaluate she could not evaluate we could not evaluate you could not evaluate they could not evaluate
V-ing form
I could not be evaluating you could not be evaluating she could not be evaluating we could not be evaluating you could not be evaluating they could not be evaluating
Perfect
I could not have evaluated you could not have evaluated she could not have evaluated we could not have evaluated you could not have evaluated they could not have evaluated
V-ing perfect
I could not have been evaluating you could not have been evaluating she could not have been evaluating we could not have been evaluating you could not have been evaluating they could not have been evaluating
Interrogative form
Simple form
could I evaluate? could you evaluate? could she evaluate? could we evaluate? could you evaluate? could they evaluate?
V-ing form
could I be evaluating? could you be evaluating? could she be evaluating? could we be evaluating? could you be evaluating? could they be evaluating?
Perfect
could I have evaluated? could you have evaluated? could she have evaluated? could we have evaluated? could you have evaluated? could they have evaluated?
V-ing perfect
could I have been evaluating? could you have been evaluating? could she have been evaluating? could we have been evaluating? could you have been evaluating? could they have been evaluating?
Interro-negative form
Simple form
could I not evaluate? could you not evaluate? could she not evaluate? could we not evaluate? could you not evaluate? could they not evaluate?
V-ing form
could I not be evaluating? could you not be evaluating? could she not be evaluating? could we not be evaluating? could you not be evaluating? could they not be evaluating?
Perfect
could I not have evaluated? could you not have evaluated? could she not have evaluated? could we not have evaluated? could you not have evaluated? could they not have evaluated?
V-ing perfect
could I not have been evaluating? could you not have been evaluating? could she not have been evaluating? could we not have been evaluating? could you not have been evaluating? could they not have been evaluating?