English verb conjugation
COULD DECOLORIZE

Regular verb: decolorize - decolorized - decolorized

Affirmation

Simple form	V-ing form
I could decolorize you could decolorize he could decolorize we could decolorize you could decolorize they could decolorize	I could be decolorizing you could be decolorizing he could be decolorizing we could be decolorizing you could be decolorizing they could be decolorizing
Perfect	V-ing perfect
I could have decolorized you could have decolorized he could have decolorized we could have decolorized you could have decolorized they could have decolorized	I could have been decolorizing you could have been decolorizing he could have been decolorizing we could have been decolorizing you could have been decolorizing they could have been decolorizing

Negation

Simple form	V-ing form
I couldn't decolorize you couldn't decolorize he couldn't decolorize we couldn't decolorize you couldn't decolorize they couldn't decolorize	I couldn't be decolorizing you couldn't be decolorizing he couldn't be decolorizing we couldn't be decolorizing you couldn't be decolorizing they couldn't be decolorizing
Perfect	V-ing perfect
I couldn't have decolorized you couldn't have decolorized he couldn't have decolorized we couldn't have decolorized you couldn't have decolorized they couldn't have decolorized	I couldn't have been decolorizing you couldn't have been decolorizing he couldn't have been decolorizing we couldn't have been decolorizing you couldn't have been decolorizing they couldn't have been decolorizing

Interrogative form

Simple form	V-ing form
could I decolorize? could you decolorize? could he decolorize? could we decolorize? could you decolorize? could they decolorize?	could I be decolorizing? could you be decolorizing? could he be decolorizing? could we be decolorizing? could you be decolorizing? could they be decolorizing?
Perfect	V-ing perfect
could I have decolorized? could you have decolorized? could he have decolorized? could we have decolorized? could you have decolorized? could they have decolorized?	could I have been decolorizing? could you have been decolorizing? could he have been decolorizing? could we have been decolorizing? could you have been decolorizing? could they have been decolorizing?

Interro-negative form

Simple form	V-ing form
couldn't I decolorize? couldn't you decolorize? couldn't he decolorize? couldn't we decolorize? couldn't you decolorize? couldn't they decolorize?	couldn't I be decolorizing? couldn't you be decolorizing? couldn't he be decolorizing? couldn't we be decolorizing? couldn't you be decolorizing? couldn't they be decolorizing?
Perfect	V-ing perfect
couldn't I have decolorized? couldn't you have decolorized? couldn't he have decolorized? couldn't we have decolorized? couldn't you have decolorized? couldn't they have decolorized?	couldn't I have been decolorizing? couldn't you have been decolorizing? couldn't he have been decolorizing? couldn't we have been decolorizing? couldn't you have been decolorizing? couldn't they have been decolorizing?