should concenter
Regular verb: concenter - concentered- concentered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should concenter
you should concenter
he should concenter
we should concenter
you should concenter
they should concenter 	I should be concentering
you should be concentering
he should be concentering
we should be concentering
you should be concentering
they should be concentering	I should have concentered
you should have concentered
he should have concentered
we should have concentered
you should have concentered
they should have concentered	I should have been concentering
you should have been concentering
he should have been concentering
we should have been concentering
you should have been concentering
they should have been concentering	

Negation 	
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I should not concenter
you should not concenter
he should not concenter
we should not concenter
you should not concenter
they should not concenter 	I should not be concentering
you should not be concentering
he should not be concentering
we should not be concentering
you should not be concentering
they should not be concentering	I should not have concentered
you should not have concentered
he should not have concentered
we should not have concentered
you should not have concentered
they should not have concentered	I should not have been concentering
you should not have been concentering
he should not have been concentering
we should not have been concentering
you should not have been concentering
they should not have been concentering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not concenter?
should you not concenter?
should he not concenter?
should we not concenter?
should you not concenter?
should they not concenter? 	should I not be concentering?
should you not be concentering?
should he not be concentering?
should we not be concentering?
should you not be concentering?
should they not be concentering? 	should I not have concentered?
should you not have concentered?
should he not have concentered?
should we not have concentered?
should you not have concentered?
should they not have concentered? 	should I not have been concentering?
should you not have been concentering?
should he not have been concentering?
should we not have been concentering?
should you not have been concentering?
should they not have been concentering?