could symmetrize
Regular verb: symmetrize - symmetrized- symmetrized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could symmetrize
you could symmetrize
he could symmetrize
we could symmetrize
you could symmetrize
they could symmetrize 	I could be symmetrizing
you could be symmetrizing
he could be symmetrizing
we could be symmetrizing
you could be symmetrizing
they could be symmetrizing	I could have symmetrized
you could have symmetrized
he could have symmetrized
we could have symmetrized
you could have symmetrized
they could have symmetrized	I could have been symmetrizing
you could have been symmetrizing
he could have been symmetrizing
we could have been symmetrizing
you could have been symmetrizing
they could have been symmetrizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't symmetrize
you couldn't symmetrize
he couldn't symmetrize
we couldn't symmetrize
you couldn't symmetrize
they couldn't symmetrize 	I couldn't be symmetrizing
you couldn't be symmetrizing
he couldn't be symmetrizing
we couldn't be symmetrizing
you couldn't be symmetrizing
they couldn't be symmetrizing	I couldn't have symmetrized
you couldn't have symmetrized
he couldn't have symmetrized
we couldn't have symmetrized
you couldn't have symmetrized
they couldn't have symmetrized	I couldn't have been symmetrizing
you couldn't have been symmetrizing
he couldn't have been symmetrizing
we couldn't have been symmetrizing
you couldn't have been symmetrizing
they couldn't have been symmetrizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I symmetrize?
could you symmetrize?
could he symmetrize?
could we symmetrize?
could you symmetrize?
could they symmetrize? 	could I be symmetrizing?
could you be symmetrizing?
could he be symmetrizing?
could we be symmetrizing?
could you be symmetrizing?
could they be symmetrizing? 	could I have symmetrized?
could you have symmetrized?
could he have symmetrized?
could we have symmetrized?
could you have symmetrized?
could they have symmetrized? 	could I have been symmetrizing?
could you have been symmetrizing?
could he have been symmetrizing?
could we have been symmetrizing?
could you have been symmetrizing?
could they have been symmetrizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I symmetrize?
couldn't you symmetrize?
couldn't he symmetrize?
couldn't we symmetrize?
couldn't you symmetrize?
couldn't they symmetrize? 	couldn't I be symmetrizing?
couldn't you be symmetrizing?
couldn't he be symmetrizing?
couldn't we be symmetrizing?
couldn't you be symmetrizing?
couldn't they be symmetrizing? 	couldn't I have symmetrized?
couldn't you have symmetrized?
couldn't he have symmetrized?
couldn't we have symmetrized?
couldn't you have symmetrized?
couldn't they have symmetrized? 	couldn't I have been symmetrizing?
couldn't you have been symmetrizing?
couldn't he have been symmetrizing?
couldn't we have been symmetrizing?
couldn't you have been symmetrizing?
couldn't they have been symmetrizing?