could optimize
Regular verb: optimize - optimized- optimized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could optimize
you could optimize
he could optimize
we could optimize
you could optimize
they could optimize 	I could be optimizing
you could be optimizing
he could be optimizing
we could be optimizing
you could be optimizing
they could be optimizing	I could have optimized
you could have optimized
he could have optimized
we could have optimized
you could have optimized
they could have optimized	I could have been optimizing
you could have been optimizing
he could have been optimizing
we could have been optimizing
you could have been optimizing
they could have been optimizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't optimize
you couldn't optimize
he couldn't optimize
we couldn't optimize
you couldn't optimize
they couldn't optimize 	I couldn't be optimizing
you couldn't be optimizing
he couldn't be optimizing
we couldn't be optimizing
you couldn't be optimizing
they couldn't be optimizing	I couldn't have optimized
you couldn't have optimized
he couldn't have optimized
we couldn't have optimized
you couldn't have optimized
they couldn't have optimized	I couldn't have been optimizing
you couldn't have been optimizing
he couldn't have been optimizing
we couldn't have been optimizing
you couldn't have been optimizing
they couldn't have been optimizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I optimize?
could you optimize?
could he optimize?
could we optimize?
could you optimize?
could they optimize? 	could I be optimizing?
could you be optimizing?
could he be optimizing?
could we be optimizing?
could you be optimizing?
could they be optimizing? 	could I have optimized?
could you have optimized?
could he have optimized?
could we have optimized?
could you have optimized?
could they have optimized? 	could I have been optimizing?
could you have been optimizing?
could he have been optimizing?
could we have been optimizing?
could you have been optimizing?
could they have been optimizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I optimize?
couldn't you optimize?
couldn't he optimize?
couldn't we optimize?
couldn't you optimize?
couldn't they optimize? 	couldn't I be optimizing?
couldn't you be optimizing?
couldn't he be optimizing?
couldn't we be optimizing?
couldn't you be optimizing?
couldn't they be optimizing? 	couldn't I have optimized?
couldn't you have optimized?
couldn't he have optimized?
couldn't we have optimized?
couldn't you have optimized?
couldn't they have optimized? 	couldn't I have been optimizing?
couldn't you have been optimizing?
couldn't he have been optimizing?
couldn't we have been optimizing?
couldn't you have been optimizing?
couldn't they have been optimizing?