I can customize you can customize he can customize we can customize you can customize they can customize
V-ing form
I can be customizing you can be customizing he can be customizing we can be customizing you can be customizing they can be customizing
Perfect
I can have customized you can have customized he can have customized we can have customized you can have customized they can have customized
V-ing perfect
I can have been customizing you can have been customizing he can have been customizing we can have been customizing you can have been customizing they can have been customizing
Negation
Simple form
I can't customize you can't customize he can't customize we can't customize you can't customize they can't customize
V-ing form
I can't be customizing you can't be customizing he can't be customizing we can't be customizing you can't be customizing they can't be customizing
Perfect
I can't have customized you can't have customized he can't have customized we can't have customized you can't have customized they can't have customized
V-ing perfect
I can't have been customizing you can't have been customizing he can't have been customizing we can't have been customizing you can't have been customizing they can't have been customizing
Interrogative form
Simple form
can I customize? can you customize? can he customize? can we customize? can you customize? can they customize?
V-ing form
can I be customizing? can you be customizing? can he be customizing? can we be customizing? can you be customizing? can they be customizing?
Perfect
can I have customized? can you have customized? can he have customized? can we have customized? can you have customized? can they have customized?
V-ing perfect
can I have been customizing? can you have been customizing? can he have been customizing? can we have been customizing? can you have been customizing? can they have been customizing?
Interro-negative form
Simple form
can't I customize? can't you customize? can't he customize? can't we customize? can't you customize? can't they customize?
V-ing form
can't I be customizing? can't you be customizing? can't he be customizing? can't we be customizing? can't you be customizing? can't they be customizing?
Perfect
can't I have customized? can't you have customized? can't he have customized? can't we have customized? can't you have customized? can't they have customized?
V-ing perfect
can't I have been customizing? can't you have been customizing? can't he have been customizing? can't we have been customizing? can't you have been customizing? can't they have been customizing?