English verb conjugation
COULD CUSTOMIZE

Regular verb: customize - customized - customized

Affirmation

Simple form	V-ing form
I could customize you could customize he could customize we could customize you could customize they could customize	I could be customizing you could be customizing he could be customizing we could be customizing you could be customizing they could be customizing
Perfect	V-ing perfect
I could have customized you could have customized he could have customized we could have customized you could have customized they could have customized	I could have been customizing you could have been customizing he could have been customizing we could have been customizing you could have been customizing they could have been customizing

Negation

Simple form	V-ing form
I couldn't customize you couldn't customize he couldn't customize we couldn't customize you couldn't customize they couldn't customize	I couldn't be customizing you couldn't be customizing he couldn't be customizing we couldn't be customizing you couldn't be customizing they couldn't be customizing
Perfect	V-ing perfect
I couldn't have customized you couldn't have customized he couldn't have customized we couldn't have customized you couldn't have customized they couldn't have customized	I couldn't have been customizing you couldn't have been customizing he couldn't have been customizing we couldn't have been customizing you couldn't have been customizing they couldn't have been customizing

Interrogative form

Simple form	V-ing form
could I customize? could you customize? could he customize? could we customize? could you customize? could they customize?	could I be customizing? could you be customizing? could he be customizing? could we be customizing? could you be customizing? could they be customizing?
Perfect	V-ing perfect
could I have customized? could you have customized? could he have customized? could we have customized? could you have customized? could they have customized?	could I have been customizing? could you have been customizing? could he have been customizing? could we have been customizing? could you have been customizing? could they have been customizing?

Interro-negative form

Simple form	V-ing form
couldn't I customize? couldn't you customize? couldn't he customize? couldn't we customize? couldn't you customize? couldn't they customize?	couldn't I be customizing? couldn't you be customizing? couldn't he be customizing? couldn't we be customizing? couldn't you be customizing? couldn't they be customizing?
Perfect	V-ing perfect
couldn't I have customized? couldn't you have customized? couldn't he have customized? couldn't we have customized? couldn't you have customized? couldn't they have customized?	couldn't I have been customizing? couldn't you have been customizing? couldn't he have been customizing? couldn't we have been customizing? couldn't you have been customizing? couldn't they have been customizing?