English verb conjugation
CAN CROSSRUFF

Regular verb: crossruff - crossruffed - crossruffed

Affirmation

Simple form	V-ing form
I can crossruff you can crossruff he can crossruff we can crossruff you can crossruff they can crossruff	I can be crossruffing you can be crossruffing he can be crossruffing we can be crossruffing you can be crossruffing they can be crossruffing
Perfect	V-ing perfect
I can have crossruffed you can have crossruffed he can have crossruffed we can have crossruffed you can have crossruffed they can have crossruffed	I can have been crossruffing you can have been crossruffing he can have been crossruffing we can have been crossruffing you can have been crossruffing they can have been crossruffing

Negation

Simple form	V-ing form
I cannot crossruff you cannot crossruff he cannot crossruff we cannot crossruff you cannot crossruff they cannot crossruff	I cannot be crossruffing you cannot be crossruffing he cannot be crossruffing we cannot be crossruffing you cannot be crossruffing they cannot be crossruffing
Perfect	V-ing perfect
I cannot have crossruffed you cannot have crossruffed he cannot have crossruffed we cannot have crossruffed you cannot have crossruffed they cannot have crossruffed	I cannot have been crossruffing you cannot have been crossruffing he cannot have been crossruffing we cannot have been crossruffing you cannot have been crossruffing they cannot have been crossruffing

Interrogative form

Simple form	V-ing form
can I crossruff? can you crossruff? can he crossruff? can we crossruff? can you crossruff? can they crossruff?	can I be crossruffing? can you be crossruffing? can he be crossruffing? can we be crossruffing? can you be crossruffing? can they be crossruffing?
Perfect	V-ing perfect
can I have crossruffed? can you have crossruffed? can he have crossruffed? can we have crossruffed? can you have crossruffed? can they have crossruffed?	can I have been crossruffing? can you have been crossruffing? can he have been crossruffing? can we have been crossruffing? can you have been crossruffing? can they have been crossruffing?

Interro-negative form

Simple form	V-ing form
can I not crossruff? can you not crossruff? can he not crossruff? can we not crossruff? can you not crossruff? can they not crossruff?	can I not be crossruffing? can you not be crossruffing? can he not be crossruffing? can we not be crossruffing? can you not be crossruffing? can they not be crossruffing?
Perfect	V-ing perfect
can I not have crossruffed? can you not have crossruffed? can he not have crossruffed? can we not have crossruffed? can you not have crossruffed? can they not have crossruffed?	can I not have been crossruffing? can you not have been crossruffing? can he not have been crossruffing? can we not have been crossruffing? can you not have been crossruffing? can they not have been crossruffing?