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 can't checker you can't checker she can't checker we can't checker you can't checker they can't checker	I can't be checkering you can't be checkering she can't be checkering we can't be checkering you can't be checkering they can't be checkering
Perfect	V-ing perfect
I can't have checkered you can't have checkered she can't have checkered we can't have checkered you can't have checkered they can't have checkered	I can't have been checkering you can't have been checkering she can't have been checkering we can't have been checkering you can't have been checkering they can't 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't I checker? can't you checker? can't she checker? can't we checker? can't you checker? can't they checker?	can't I be checkering? can't you be checkering? can't she be checkering? can't we be checkering? can't you be checkering? can't they be checkering?
Perfect	V-ing perfect
can't I have checkered? can't you have checkered? can't she have checkered? can't we have checkered? can't you have checkered? can't they have checkered?	can't I have been checkering? can't you have been checkering? can't she have been checkering? can't we have been checkering? can't you have been checkering? can't they have been checkering?