English verb conjugation
CAN NULL

Regular verb: null - nulled - nulled

Affirmation

Simple form	V-ing form
I can null you can null he can null we can null you can null they can null	I can be nulling you can be nulling he can be nulling we can be nulling you can be nulling they can be nulling
Perfect	V-ing perfect
I can have nulled you can have nulled he can have nulled we can have nulled you can have nulled they can have nulled	I can have been nulling you can have been nulling he can have been nulling we can have been nulling you can have been nulling they can have been nulling

Negation

Simple form	V-ing form
I cannot null you cannot null he cannot null we cannot null you cannot null they cannot null	I cannot be nulling you cannot be nulling he cannot be nulling we cannot be nulling you cannot be nulling they cannot be nulling
Perfect	V-ing perfect
I cannot have nulled you cannot have nulled he cannot have nulled we cannot have nulled you cannot have nulled they cannot have nulled	I cannot have been nulling you cannot have been nulling he cannot have been nulling we cannot have been nulling you cannot have been nulling they cannot have been nulling

Interrogative form

Simple form	V-ing form
can I null? can you null? can he null? can we null? can you null? can they null?	can I be nulling? can you be nulling? can he be nulling? can we be nulling? can you be nulling? can they be nulling?
Perfect	V-ing perfect
can I have nulled? can you have nulled? can he have nulled? can we have nulled? can you have nulled? can they have nulled?	can I have been nulling? can you have been nulling? can he have been nulling? can we have been nulling? can you have been nulling? can they have been nulling?

Interro-negative form

Simple form	V-ing form
can I not null? can you not null? can he not null? can we not null? can you not null? can they not null?	can I not be nulling? can you not be nulling? can he not be nulling? can we not be nulling? can you not be nulling? can they not be nulling?
Perfect	V-ing perfect
can I not have nulled? can you not have nulled? can he not have nulled? can we not have nulled? can you not have nulled? can they not have nulled?	can I not have been nulling? can you not have been nulling? can he not have been nulling? can we not have been nulling? can you not have been nulling? can they not have been nulling?