may concenter
Verbo regular: concenter - concentered- concentered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may concenter
you may concenter
he may concenter
we may concenter
you may concenter
they may concenter 	I may be concentering
you may be concentering
he may be concentering
we may be concentering
you may be concentering
they may be concentering	I may have concentered
you may have concentered
he may have concentered
we may have concentered
you may have concentered
they may have concentered	I may have been concentering
you may have been concentering
he may have been concentering
we may have been concentering
you may have been concentering
they may have been concentering	

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

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

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