I can specialize you can specialize he can specialize we can specialize you can specialize they can specialize
V-ing form
I can be specializing you can be specializing he can be specializing we can be specializing you can be specializing they can be specializing
Perfect
I can have specialized you can have specialized he can have specialized we can have specialized you can have specialized they can have specialized
V-ing perfect
I can have been specializing you can have been specializing he can have been specializing we can have been specializing you can have been specializing they can have been specializing
Negation
Simple form
I cannot specialize you cannot specialize he cannot specialize we cannot specialize you cannot specialize they cannot specialize
V-ing form
I cannot be specializing you cannot be specializing he cannot be specializing we cannot be specializing you cannot be specializing they cannot be specializing
Perfect
I cannot have specialized you cannot have specialized he cannot have specialized we cannot have specialized you cannot have specialized they cannot have specialized
V-ing perfect
I cannot have been specializing you cannot have been specializing he cannot have been specializing we cannot have been specializing you cannot have been specializing they cannot have been specializing
Interrogative form
Simple form
can I specialize? can you specialize? can he specialize? can we specialize? can you specialize? can they specialize?
V-ing form
can I be specializing? can you be specializing? can he be specializing? can we be specializing? can you be specializing? can they be specializing?
Perfect
can I have specialized? can you have specialized? can he have specialized? can we have specialized? can you have specialized? can they have specialized?
V-ing perfect
can I have been specializing? can you have been specializing? can he have been specializing? can we have been specializing? can you have been specializing? can they have been specializing?
Interro-negative form
Simple form
can I not specialize? can you not specialize? can he not specialize? can we not specialize? can you not specialize? can they not specialize?
V-ing form
can I not be specializing? can you not be specializing? can he not be specializing? can we not be specializing? can you not be specializing? can they not be specializing?
Perfect
can I not have specialized? can you not have specialized? can he not have specialized? can we not have specialized? can you not have specialized? can they not have specialized?
V-ing perfect
can I not have been specializing? can you not have been specializing? can he not have been specializing? can we not have been specializing? can you not have been specializing? can they not have been specializing?