can check
Verbo regular: check - checked- checked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can check
you can check
he can check
we can check
you can check
they can check 	I can be checking
you can be checking
he can be checking
we can be checking
you can be checking
they can be checking	I can have checked
you can have checked
he can have checked
we can have checked
you can have checked
they can have checked	I can have been checking
you can have been checking
he can have been checking
we can have been checking
you can have been checking
they can have been checking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't check
you can't check
he can't check
we can't check
you can't check
they can't check 	I can't be checking
you can't be checking
he can't be checking
we can't be checking
you can't be checking
they can't be checking	I can't have checked
you can't have checked
he can't have checked
we can't have checked
you can't have checked
they can't have checked	I can't have been checking
you can't have been checking
he can't have been checking
we can't have been checking
you can't have been checking
they can't have been checking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I check?
can you check?
can he check?
can we check?
can you check?
can they check? 	can I be checking?
can you be checking?
can he be checking?
can we be checking?
can you be checking?
can they be checking? 	can I have checked?
can you have checked?
can he have checked?
can we have checked?
can you have checked?
can they have checked? 	can I have been checking?
can you have been checking?
can he have been checking?
can we have been checking?
can you have been checking?
can they have been checking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I check?
can't you check?
can't he check?
can't we check?
can't you check?
can't they check? 	can't I be checking?
can't you be checking?
can't he be checking?
can't we be checking?
can't you be checking?
can't they be checking? 	can't I have checked?
can't you have checked?
can't he have checked?
can't we have checked?
can't you have checked?
can't they have checked? 	can't I have been checking?
can't you have been checking?
can't he have been checking?
can't we have been checking?
can't you have been checking?
can't they have been checking?