can register
Verbo regular: register - registered- registered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can register
you can register
he can register
we can register
you can register
they can register 	I can be registering
you can be registering
he can be registering
we can be registering
you can be registering
they can be registering	I can have registered
you can have registered
he can have registered
we can have registered
you can have registered
they can have registered	I can have been registering
you can have been registering
he can have been registering
we can have been registering
you can have been registering
they can have been registering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't register
you can't register
he can't register
we can't register
you can't register
they can't register 	I can't be registering
you can't be registering
he can't be registering
we can't be registering
you can't be registering
they can't be registering	I can't have registered
you can't have registered
he can't have registered
we can't have registered
you can't have registered
they can't have registered	I can't have been registering
you can't have been registering
he can't have been registering
we can't have been registering
you can't have been registering
they can't have been registering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I register?
can you register?
can he register?
can we register?
can you register?
can they register? 	can I be registering?
can you be registering?
can he be registering?
can we be registering?
can you be registering?
can they be registering? 	can I have registered?
can you have registered?
can he have registered?
can we have registered?
can you have registered?
can they have registered? 	can I have been registering?
can you have been registering?
can he have been registering?
can we have been registering?
can you have been registering?
can they have been registering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I register?
can't you register?
can't he register?
can't we register?
can't you register?
can't they register? 	can't I be registering?
can't you be registering?
can't he be registering?
can't we be registering?
can't you be registering?
can't they be registering? 	can't I have registered?
can't you have registered?
can't he have registered?
can't we have registered?
can't you have registered?
can't they have registered? 	can't I have been registering?
can't you have been registering?
can't he have been registering?
can't we have been registering?
can't you have been registering?
can't they have been registering?