should concenter
Verbo regular: concenter - concentered- concentered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I'd concenter
you'd concenter
he'd concenter
we'd concenter
you'd concenter
they'd concenter 	I'd be concentering
you'd be concentering
he'd be concentering
we'd be concentering
you'd be concentering
they'd be concentering	I should've concentered
you should've concentered
he should've concentered
we should've concentered
you should've concentered
they should've concentered	I should've been concentering
you should've been concentering
he should've been concentering
we should've been concentering
you should've been concentering
they should've been concentering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I shouldn't concenter
you shouldn't concenter
he shouldn't concenter
we shouldn't concenter
you shouldn't concenter
they shouldn't concenter 	I shouldn't be concentering
you shouldn't be concentering
he shouldn't be concentering
we shouldn't be concentering
you shouldn't be concentering
they shouldn't be concentering	I shouldn't have concentered
you shouldn't have concentered
he shouldn't have concentered
we shouldn't have concentered
you shouldn't have concentered
they shouldn't have concentered	I shouldn't have been concentering
you shouldn't have been concentering
he shouldn't have been concentering
we shouldn't have been concentering
you shouldn't have been concentering
they shouldn't have been concentering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I concenter?
should you concenter?
should he concenter?
should we concenter?
should you concenter?
should they concenter? 	should I be concentering?
should you be concentering?
should he be concentering?
should we be concentering?
should you be concentering?
should they be concentering? 	should I have concentered?
should you have concentered?
should he have concentered?
should we have concentered?
should you have concentered?
should they have concentered? 	should I have been concentering?
should you have been concentering?
should he have been concentering?
should we have been concentering?
should you have been concentering?
should they have been concentering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
shouldn't I concenter?
shouldn't you concenter?
shouldn't he concenter?
shouldn't we concenter?
shouldn't you concenter?
shouldn't they concenter? 	shouldn't I be concentering?
shouldn't you be concentering?
shouldn't he be concentering?
shouldn't we be concentering?
shouldn't you be concentering?
shouldn't they be concentering? 	shouldn't I have concentered?
shouldn't you have concentered?
shouldn't he have concentered?
shouldn't we have concentered?
shouldn't you have concentered?
shouldn't they have concentered? 	shouldn't I have been concentering?
shouldn't you have been concentering?
shouldn't he have been concentering?
shouldn't we have been concentering?
shouldn't you have been concentering?
shouldn't they have been concentering?