English verb conjugation
CAN CHECKER

Regular verb: checker - checkered - checkered

Affirmation

Simple form	V-ing form
I can checker you can checker she can checker we can checker you can checker they can checker	I can be checkering you can be checkering she can be checkering we can be checkering you can be checkering they can be checkering
Perfect	V-ing perfect
I can have checkered you can have checkered she can have checkered we can have checkered you can have checkered they can have checkered	I can have been checkering you can have been checkering she can have been checkering we can have been checkering you can have been checkering they can have been checkering

Negation

Simple form	V-ing form
I cannot checker you cannot checker she cannot checker we cannot checker you cannot checker they cannot checker	I cannot be checkering you cannot be checkering she cannot be checkering we cannot be checkering you cannot be checkering they cannot be checkering
Perfect	V-ing perfect
I cannot have checkered you cannot have checkered she cannot have checkered we cannot have checkered you cannot have checkered they cannot have checkered	I cannot have been checkering you cannot have been checkering she cannot have been checkering we cannot have been checkering you cannot have been checkering they cannot have been checkering

Interrogative form

Simple form	V-ing form
can I checker? can you checker? can she checker? can we checker? can you checker? can they checker?	can I be checkering? can you be checkering? can she be checkering? can we be checkering? can you be checkering? can they be checkering?
Perfect	V-ing perfect
can I have checkered? can you have checkered? can she have checkered? can we have checkered? can you have checkered? can they have checkered?	can I have been checkering? can you have been checkering? can she have been checkering? can we have been checkering? can you have been checkering? can they have been checkering?

Interro-negative form

Simple form	V-ing form
can I not checker? can you not checker? can she not checker? can we not checker? can you not checker? can they not checker?	can I not be checkering? can you not be checkering? can she not be checkering? can we not be checkering? can you not be checkering? can they not be checkering?
Perfect	V-ing perfect
can I not have checkered? can you not have checkered? can she not have checkered? can we not have checkered? can you not have checkered? can they not have checkered?	can I not have been checkering? can you not have been checkering? can she not have been checkering? can we not have been checkering? can you not have been checkering? can they not have been checkering?