English verb conjugation
CAN CHECKER

Regular verb: checker - checkered - checkered

Affirmation

Simple form	V-ing form
I can checker you can checker he can checker we can checker you can checker they can checker	I can be checkering you can be checkering he 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 he 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 he 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 he 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 he 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 he 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 he 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 he checker? can we checker? can you checker? can they checker?	can I be checkering? can you be checkering? can he 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 he 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 he 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 he 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 he 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 he 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 he have been checkering? can't we have been checkering? can't you have been checkering? can't they have been checkering?