can concenter
Verbe régulier : concenter - concentered- concentered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I can concenter
you can concenter
she can concenter
we can concenter
you can concenter
they can concenter 	I can be concentering
you can be concentering
she can be concentering
we can be concentering
you can be concentering
they can be concentering	I can have concentered
you can have concentered
she can have concentered
we can have concentered
you can have concentered
they can have concentered	I can have been concentering
you can have been concentering
she can have been concentering
we can have been concentering
you can have been concentering
they can have been concentering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I can't concenter
you can't concenter
she can't concenter
we can't concenter
you can't concenter
they can't concenter 	I can't be concentering
you can't be concentering
she can't be concentering
we can't be concentering
you can't be concentering
they can't be concentering	I can't have concentered
you can't have concentered
she can't have concentered
we can't have concentered
you can't have concentered
they can't have concentered	I can't have been concentering
you can't have been concentering
she can't have been concentering
we can't have been concentering
you can't have been concentering
they can't have been concentering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
can I concenter?
can you concenter?
can she concenter?
can we concenter?
can you concenter?
can they concenter? 	can I be concentering?
can you be concentering?
can she be concentering?
can we be concentering?
can you be concentering?
can they be concentering? 	can I have concentered?
can you have concentered?
can she have concentered?
can we have concentered?
can you have concentered?
can they have concentered? 	can I have been concentering?
can you have been concentering?
can she have been concentering?
can we have been concentering?
can you have been concentering?
can they have been concentering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
can't I concenter?
can't you concenter?
can't she concenter?
can't we concenter?
can't you concenter?
can't they concenter? 	can't I be concentering?
can't you be concentering?
can't she be concentering?
can't we be concentering?
can't you be concentering?
can't they be concentering? 	can't I have concentered?
can't you have concentered?
can't she have concentered?
can't we have concentered?
can't you have concentered?
can't they have concentered? 	can't I have been concentering?
can't you have been concentering?
can't she have been concentering?
can't we have been concentering?
can't you have been concentering?
can't they have been concentering?