English verb conjugation
CAN CROW

Regular verb: crow - crowed - crowed

Affirmation

Simple form	V-ing form
I can crow you can crow he can crow we can crow you can crow they can crow	I can be crowing you can be crowing he can be crowing we can be crowing you can be crowing they can be crowing
Perfect	V-ing perfect
I can have crowed you can have crowed he can have crowed we can have crowed you can have crowed they can have crowed	I can have been crowing you can have been crowing he can have been crowing we can have been crowing you can have been crowing they can have been crowing

Negation

Simple form	V-ing form
I cannot crow you cannot crow he cannot crow we cannot crow you cannot crow they cannot crow	I cannot be crowing you cannot be crowing he cannot be crowing we cannot be crowing you cannot be crowing they cannot be crowing
Perfect	V-ing perfect
I cannot have crowed you cannot have crowed he cannot have crowed we cannot have crowed you cannot have crowed they cannot have crowed	I cannot have been crowing you cannot have been crowing he cannot have been crowing we cannot have been crowing you cannot have been crowing they cannot have been crowing

Interrogative form

Simple form	V-ing form
can I crow? can you crow? can he crow? can we crow? can you crow? can they crow?	can I be crowing? can you be crowing? can he be crowing? can we be crowing? can you be crowing? can they be crowing?
Perfect	V-ing perfect
can I have crowed? can you have crowed? can he have crowed? can we have crowed? can you have crowed? can they have crowed?	can I have been crowing? can you have been crowing? can he have been crowing? can we have been crowing? can you have been crowing? can they have been crowing?

Interro-negative form

Simple form	V-ing form
can I not crow? can you not crow? can he not crow? can we not crow? can you not crow? can they not crow?	can I not be crowing? can you not be crowing? can he not be crowing? can we not be crowing? can you not be crowing? can they not be crowing?
Perfect	V-ing perfect
can I not have crowed? can you not have crowed? can he not have crowed? can we not have crowed? can you not have crowed? can they not have crowed?	can I not have been crowing? can you not have been crowing? can he not have been crowing? can we not have been crowing? can you not have been crowing? can they not have been crowing?