could iodize
Regular verb: iodize - iodized- iodized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could iodize
you could iodize
he could iodize
we could iodize
you could iodize
they could iodize 	I could be iodizing
you could be iodizing
he could be iodizing
we could be iodizing
you could be iodizing
they could be iodizing	I could have iodized
you could have iodized
he could have iodized
we could have iodized
you could have iodized
they could have iodized	I could have been iodizing
you could have been iodizing
he could have been iodizing
we could have been iodizing
you could have been iodizing
they could have been iodizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't iodize
you couldn't iodize
he couldn't iodize
we couldn't iodize
you couldn't iodize
they couldn't iodize 	I couldn't be iodizing
you couldn't be iodizing
he couldn't be iodizing
we couldn't be iodizing
you couldn't be iodizing
they couldn't be iodizing	I couldn't have iodized
you couldn't have iodized
he couldn't have iodized
we couldn't have iodized
you couldn't have iodized
they couldn't have iodized	I couldn't have been iodizing
you couldn't have been iodizing
he couldn't have been iodizing
we couldn't have been iodizing
you couldn't have been iodizing
they couldn't have been iodizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I iodize?
could you iodize?
could he iodize?
could we iodize?
could you iodize?
could they iodize? 	could I be iodizing?
could you be iodizing?
could he be iodizing?
could we be iodizing?
could you be iodizing?
could they be iodizing? 	could I have iodized?
could you have iodized?
could he have iodized?
could we have iodized?
could you have iodized?
could they have iodized? 	could I have been iodizing?
could you have been iodizing?
could he have been iodizing?
could we have been iodizing?
could you have been iodizing?
could they have been iodizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I iodize?
couldn't you iodize?
couldn't he iodize?
couldn't we iodize?
couldn't you iodize?
couldn't they iodize? 	couldn't I be iodizing?
couldn't you be iodizing?
couldn't he be iodizing?
couldn't we be iodizing?
couldn't you be iodizing?
couldn't they be iodizing? 	couldn't I have iodized?
couldn't you have iodized?
couldn't he have iodized?
couldn't we have iodized?
couldn't you have iodized?
couldn't they have iodized? 	couldn't I have been iodizing?
couldn't you have been iodizing?
couldn't he have been iodizing?
couldn't we have been iodizing?
couldn't you have been iodizing?
couldn't they have been iodizing?