could categorize
Regular verb: categorize - categorized- categorized

Affirmation 	
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I could categorize
you could categorize
he could categorize
we could categorize
you could categorize
they could categorize 	I could be categorizing
you could be categorizing
he could be categorizing
we could be categorizing
you could be categorizing
they could be categorizing	I could have categorized
you could have categorized
he could have categorized
we could have categorized
you could have categorized
they could have categorized	I could have been categorizing
you could have been categorizing
he could have been categorizing
we could have been categorizing
you could have been categorizing
they could have been categorizing	

Negation 	
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I couldn't categorize
you couldn't categorize
he couldn't categorize
we couldn't categorize
you couldn't categorize
they couldn't categorize 	I couldn't be categorizing
you couldn't be categorizing
he couldn't be categorizing
we couldn't be categorizing
you couldn't be categorizing
they couldn't be categorizing	I couldn't have categorized
you couldn't have categorized
he couldn't have categorized
we couldn't have categorized
you couldn't have categorized
they couldn't have categorized	I couldn't have been categorizing
you couldn't have been categorizing
he couldn't have been categorizing
we couldn't have been categorizing
you couldn't have been categorizing
they couldn't have been categorizing	

Interrogative form 	
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could I categorize?
could you categorize?
could he categorize?
could we categorize?
could you categorize?
could they categorize? 	could I be categorizing?
could you be categorizing?
could he be categorizing?
could we be categorizing?
could you be categorizing?
could they be categorizing? 	could I have categorized?
could you have categorized?
could he have categorized?
could we have categorized?
could you have categorized?
could they have categorized? 	could I have been categorizing?
could you have been categorizing?
could he have been categorizing?
could we have been categorizing?
could you have been categorizing?
could they have been categorizing? 	

Interro-negative form 	
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couldn't I categorize?
couldn't you categorize?
couldn't he categorize?
couldn't we categorize?
couldn't you categorize?
couldn't they categorize? 	couldn't I be categorizing?
couldn't you be categorizing?
couldn't he be categorizing?
couldn't we be categorizing?
couldn't you be categorizing?
couldn't they be categorizing? 	couldn't I have categorized?
couldn't you have categorized?
couldn't he have categorized?
couldn't we have categorized?
couldn't you have categorized?
couldn't they have categorized? 	couldn't I have been categorizing?
couldn't you have been categorizing?
couldn't he have been categorizing?
couldn't we have been categorizing?
couldn't you have been categorizing?
couldn't they have been categorizing?