I can wolf you can wolf he can wolf we can wolf you can wolf they can wolf
V-ing form
I can be wolfing you can be wolfing he can be wolfing we can be wolfing you can be wolfing they can be wolfing
Perfect
I can have wolfed you can have wolfed he can have wolfed we can have wolfed you can have wolfed they can have wolfed
V-ing perfect
I can have been wolfing you can have been wolfing he can have been wolfing we can have been wolfing you can have been wolfing they can have been wolfing
Negation
Simple form
I cannot wolf you cannot wolf he cannot wolf we cannot wolf you cannot wolf they cannot wolf
V-ing form
I cannot be wolfing you cannot be wolfing he cannot be wolfing we cannot be wolfing you cannot be wolfing they cannot be wolfing
Perfect
I cannot have wolfed you cannot have wolfed he cannot have wolfed we cannot have wolfed you cannot have wolfed they cannot have wolfed
V-ing perfect
I cannot have been wolfing you cannot have been wolfing he cannot have been wolfing we cannot have been wolfing you cannot have been wolfing they cannot have been wolfing
Interrogative form
Simple form
can I wolf? can you wolf? can he wolf? can we wolf? can you wolf? can they wolf?
V-ing form
can I be wolfing? can you be wolfing? can he be wolfing? can we be wolfing? can you be wolfing? can they be wolfing?
Perfect
can I have wolfed? can you have wolfed? can he have wolfed? can we have wolfed? can you have wolfed? can they have wolfed?
V-ing perfect
can I have been wolfing? can you have been wolfing? can he have been wolfing? can we have been wolfing? can you have been wolfing? can they have been wolfing?
Interro-negative form
Simple form
can I not wolf? can you not wolf? can he not wolf? can we not wolf? can you not wolf? can they not wolf?
V-ing form
can I not be wolfing? can you not be wolfing? can he not be wolfing? can we not be wolfing? can you not be wolfing? can they not be wolfing?
Perfect
can I not have wolfed? can you not have wolfed? can he not have wolfed? can we not have wolfed? can you not have wolfed? can they not have wolfed?
V-ing perfect
can I not have been wolfing? can you not have been wolfing? can he not have been wolfing? can we not have been wolfing? can you not have been wolfing? can they not have been wolfing?