could evaluate
Regular verb: evaluate - evaluated- evaluated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could evaluate
you could evaluate
he could evaluate
we could evaluate
you could evaluate
they could evaluate 	I could be evaluating
you could be evaluating
he could be evaluating
we could be evaluating
you could be evaluating
they could be evaluating	I could have evaluated
you could have evaluated
he could have evaluated
we could have evaluated
you could have evaluated
they could have evaluated	I could have been evaluating
you could have been evaluating
he could have been evaluating
we could have been evaluating
you could have been evaluating
they could have been evaluating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't evaluate
you couldn't evaluate
he couldn't evaluate
we couldn't evaluate
you couldn't evaluate
they couldn't evaluate 	I couldn't be evaluating
you couldn't be evaluating
he couldn't be evaluating
we couldn't be evaluating
you couldn't be evaluating
they couldn't be evaluating	I couldn't have evaluated
you couldn't have evaluated
he couldn't have evaluated
we couldn't have evaluated
you couldn't have evaluated
they couldn't have evaluated	I couldn't have been evaluating
you couldn't have been evaluating
he couldn't have been evaluating
we couldn't have been evaluating
you couldn't have been evaluating
they couldn't have been evaluating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I evaluate?
could you evaluate?
could he evaluate?
could we evaluate?
could you evaluate?
could they evaluate? 	could I be evaluating?
could you be evaluating?
could he be evaluating?
could we be evaluating?
could you be evaluating?
could they be evaluating? 	could I have evaluated?
could you have evaluated?
could he have evaluated?
could we have evaluated?
could you have evaluated?
could they have evaluated? 	could I have been evaluating?
could you have been evaluating?
could he have been evaluating?
could we have been evaluating?
could you have been evaluating?
could they have been evaluating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I evaluate?
couldn't you evaluate?
couldn't he evaluate?
couldn't we evaluate?
couldn't you evaluate?
couldn't they evaluate? 	couldn't I be evaluating?
couldn't you be evaluating?
couldn't he be evaluating?
couldn't we be evaluating?
couldn't you be evaluating?
couldn't they be evaluating? 	couldn't I have evaluated?
couldn't you have evaluated?
couldn't he have evaluated?
couldn't we have evaluated?
couldn't you have evaluated?
couldn't they have evaluated? 	couldn't I have been evaluating?
couldn't you have been evaluating?
couldn't he have been evaluating?
couldn't we have been evaluating?
couldn't you have been evaluating?
couldn't they have been evaluating?