I could categorize you could categorize he could categorize we could categorize you could categorize they could categorize
V-ing form
I could be categorizing you could be categorizing he could be categorizing we could be categorizing you could be categorizing they could be categorizing
Perfect
I could have categorized you could have categorized he could have categorized we could have categorized you could have categorized they could have categorized
V-ing perfect
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
Simple form
I couldn't categorize you couldn't categorize he couldn't categorize we couldn't categorize you couldn't categorize they couldn't categorize
V-ing form
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
Perfect
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
V-ing perfect
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
Simple form
could I categorize? could you categorize? could he categorize? could we categorize? could you categorize? could they categorize?
V-ing form
could I be categorizing? could you be categorizing? could he be categorizing? could we be categorizing? could you be categorizing? could they be categorizing?
Perfect
could I have categorized? could you have categorized? could he have categorized? could we have categorized? could you have categorized? could they have categorized?
V-ing perfect
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
Simple form
couldn't I categorize? couldn't you categorize? couldn't he categorize? couldn't we categorize? couldn't you categorize? couldn't they categorize?
V-ing form
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?
Perfect
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?
V-ing perfect
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?