I can concretize you can concretize he can concretize we can concretize you can concretize they can concretize
V-ing form
I can be concretizing you can be concretizing he can be concretizing we can be concretizing you can be concretizing they can be concretizing
Perfect
I can have concretized you can have concretized he can have concretized we can have concretized you can have concretized they can have concretized
V-ing perfect
I can have been concretizing you can have been concretizing he can have been concretizing we can have been concretizing you can have been concretizing they can have been concretizing
Negation
Simple form
I can't concretize you can't concretize he can't concretize we can't concretize you can't concretize they can't concretize
V-ing form
I can't be concretizing you can't be concretizing he can't be concretizing we can't be concretizing you can't be concretizing they can't be concretizing
Perfect
I can't have concretized you can't have concretized he can't have concretized we can't have concretized you can't have concretized they can't have concretized
V-ing perfect
I can't have been concretizing you can't have been concretizing he can't have been concretizing we can't have been concretizing you can't have been concretizing they can't have been concretizing
Interrogative form
Simple form
can I concretize? can you concretize? can he concretize? can we concretize? can you concretize? can they concretize?
V-ing form
can I be concretizing? can you be concretizing? can he be concretizing? can we be concretizing? can you be concretizing? can they be concretizing?
Perfect
can I have concretized? can you have concretized? can he have concretized? can we have concretized? can you have concretized? can they have concretized?
V-ing perfect
can I have been concretizing? can you have been concretizing? can he have been concretizing? can we have been concretizing? can you have been concretizing? can they have been concretizing?
Interro-negative form
Simple form
can't I concretize? can't you concretize? can't he concretize? can't we concretize? can't you concretize? can't they concretize?
V-ing form
can't I be concretizing? can't you be concretizing? can't he be concretizing? can't we be concretizing? can't you be concretizing? can't they be concretizing?
Perfect
can't I have concretized? can't you have concretized? can't he have concretized? can't we have concretized? can't you have concretized? can't they have concretized?
V-ing perfect
can't I have been concretizing? can't you have been concretizing? can't he have been concretizing? can't we have been concretizing? can't you have been concretizing? can't they have been concretizing?