I can enhance you can enhance she can enhance we can enhance you can enhance they can enhance
V-ing form
I can be enhancing you can be enhancing she can be enhancing we can be enhancing you can be enhancing they can be enhancing
Perfect
I can have enhanced you can have enhanced she can have enhanced we can have enhanced you can have enhanced they can have enhanced
V-ing perfect
I can have been enhancing you can have been enhancing she can have been enhancing we can have been enhancing you can have been enhancing they can have been enhancing
Negation
Simple form
I cannot enhance you cannot enhance she cannot enhance we cannot enhance you cannot enhance they cannot enhance
V-ing form
I cannot be enhancing you cannot be enhancing she cannot be enhancing we cannot be enhancing you cannot be enhancing they cannot be enhancing
Perfect
I cannot have enhanced you cannot have enhanced she cannot have enhanced we cannot have enhanced you cannot have enhanced they cannot have enhanced
V-ing perfect
I cannot have been enhancing you cannot have been enhancing she cannot have been enhancing we cannot have been enhancing you cannot have been enhancing they cannot have been enhancing
Interrogative form
Simple form
can I enhance? can you enhance? can she enhance? can we enhance? can you enhance? can they enhance?
V-ing form
can I be enhancing? can you be enhancing? can she be enhancing? can we be enhancing? can you be enhancing? can they be enhancing?
Perfect
can I have enhanced? can you have enhanced? can she have enhanced? can we have enhanced? can you have enhanced? can they have enhanced?
V-ing perfect
can I have been enhancing? can you have been enhancing? can she have been enhancing? can we have been enhancing? can you have been enhancing? can they have been enhancing?
Interro-negative form
Simple form
can I not enhance? can you not enhance? can she not enhance? can we not enhance? can you not enhance? can they not enhance?
V-ing form
can I not be enhancing? can you not be enhancing? can she not be enhancing? can we not be enhancing? can you not be enhancing? can they not be enhancing?
Perfect
can I not have enhanced? can you not have enhanced? can she not have enhanced? can we not have enhanced? can you not have enhanced? can they not have enhanced?
V-ing perfect
can I not have been enhancing? can you not have been enhancing? can she not have been enhancing? can we not have been enhancing? can you not have been enhancing? can they not have been enhancing?