English verb conjugation
CAN FIRE

Regular verb: fire - fired - fired

Affirmation

Simple form	V-ing form
I can fire you can fire he can fire we can fire you can fire they can fire	I can be firing you can be firing he can be firing we can be firing you can be firing they can be firing
Perfect	V-ing perfect
I can have fired you can have fired he can have fired we can have fired you can have fired they can have fired	I can have been firing you can have been firing he can have been firing we can have been firing you can have been firing they can have been firing

Negation

Simple form	V-ing form
I cannot fire you cannot fire he cannot fire we cannot fire you cannot fire they cannot fire	I cannot be firing you cannot be firing he cannot be firing we cannot be firing you cannot be firing they cannot be firing
Perfect	V-ing perfect
I cannot have fired you cannot have fired he cannot have fired we cannot have fired you cannot have fired they cannot have fired	I cannot have been firing you cannot have been firing he cannot have been firing we cannot have been firing you cannot have been firing they cannot have been firing

Interrogative form

Simple form	V-ing form
can I fire? can you fire? can he fire? can we fire? can you fire? can they fire?	can I be firing? can you be firing? can he be firing? can we be firing? can you be firing? can they be firing?
Perfect	V-ing perfect
can I have fired? can you have fired? can he have fired? can we have fired? can you have fired? can they have fired?	can I have been firing? can you have been firing? can he have been firing? can we have been firing? can you have been firing? can they have been firing?

Interro-negative form

Simple form	V-ing form
can I not fire? can you not fire? can he not fire? can we not fire? can you not fire? can they not fire?	can I not be firing? can you not be firing? can he not be firing? can we not be firing? can you not be firing? can they not be firing?
Perfect	V-ing perfect
can I not have fired? can you not have fired? can he not have fired? can we not have fired? can you not have fired? can they not have fired?	can I not have been firing? can you not have been firing? can he not have been firing? can we not have been firing? can you not have been firing? can they not have been firing?