I can behave you can behave she can behave we can behave you can behave they can behave
V-ing form
I can be behaving you can be behaving she can be behaving we can be behaving you can be behaving they can be behaving
Perfect
I can have behaved you can have behaved she can have behaved we can have behaved you can have behaved they can have behaved
V-ing perfect
I can have been behaving you can have been behaving she can have been behaving we can have been behaving you can have been behaving they can have been behaving
Negation
Simple form
I cannot behave you cannot behave she cannot behave we cannot behave you cannot behave they cannot behave
V-ing form
I cannot be behaving you cannot be behaving she cannot be behaving we cannot be behaving you cannot be behaving they cannot be behaving
Perfect
I cannot have behaved you cannot have behaved she cannot have behaved we cannot have behaved you cannot have behaved they cannot have behaved
V-ing perfect
I cannot have been behaving you cannot have been behaving she cannot have been behaving we cannot have been behaving you cannot have been behaving they cannot have been behaving
Interrogative form
Simple form
can I behave? can you behave? can she behave? can we behave? can you behave? can they behave?
V-ing form
can I be behaving? can you be behaving? can she be behaving? can we be behaving? can you be behaving? can they be behaving?
Perfect
can I have behaved? can you have behaved? can she have behaved? can we have behaved? can you have behaved? can they have behaved?
V-ing perfect
can I have been behaving? can you have been behaving? can she have been behaving? can we have been behaving? can you have been behaving? can they have been behaving?
Interro-negative form
Simple form
can I not behave? can you not behave? can she not behave? can we not behave? can you not behave? can they not behave?
V-ing form
can I not be behaving? can you not be behaving? can she not be behaving? can we not be behaving? can you not be behaving? can they not be behaving?
Perfect
can I not have behaved? can you not have behaved? can she not have behaved? can we not have behaved? can you not have behaved? can they not have behaved?
V-ing perfect
can I not have been behaving? can you not have been behaving? can she not have been behaving? can we not have been behaving? can you not have been behaving? can they not have been behaving?