can checker
Verbo regular: checker - checkered- checkered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?