English verb conjugation
OUGHT TO CONCENTER

Regular verb: concenter - concentered - concentered

Affirmation

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

Negation

Simple form	V-ing form
I oughtn't to concenter you oughtn't to concenter he oughtn't to concenter we oughtn't to concenter you oughtn't to concenter they oughtn't to concenter	I oughtn't to be concentering you oughtn't to be concentering he oughtn't to be concentering we oughtn't to be concentering you oughtn't to be concentering they oughtn't to be concentering
Perfect	V-ing perfect
I oughtn't to have concentered you oughtn't to have concentered he oughtn't to have concentered we oughtn't to have concentered you oughtn't to have concentered they oughtn't to have concentered	I oughtn't to have been concentering you oughtn't to have been concentering he oughtn't to have been concentering we oughtn't to have been concentering you oughtn't to have been concentering they oughtn't to have been concentering

Interrogative form

Simple form	V-ing form
ought to I concenter? ought to you concenter? ought to he concenter? ought to we concenter? ought to you concenter? ought to they concenter?	ought to I be concentering? ought to you be concentering? ought to he be concentering? ought to we be concentering? ought to you be concentering? ought to they be concentering?
Perfect	V-ing perfect
ought to I have concentered? ought to you have concentered? ought to he have concentered? ought to we have concentered? ought to you have concentered? ought to they have concentered?	ought to I have been concentering? ought to you have been concentering? ought to he have been concentering? ought to we have been concentering? ought to you have been concentering? ought to they have been concentering?

Interro-negative form

Simple form	V-ing form
oughtn't I to concenter? oughtn't you to concenter? oughtn't he to concenter? oughtn't we to concenter? oughtn't you to concenter? oughtn't they to concenter?	oughtn't I to be concentering? oughtn't you to be concentering? oughtn't he to be concentering? oughtn't we to be concentering? oughtn't you to be concentering? oughtn't they to be concentering?
Perfect	V-ing perfect
oughtn't I to have concentered? oughtn't you to have concentered? oughtn't he to have concentered? oughtn't we to have concentered? oughtn't you to have concentered? oughtn't they to have concentered?	oughtn't I to have been concentering? oughtn't you to have been concentering? oughtn't he to have been concentering? oughtn't we to have been concentering? oughtn't you to have been concentering? oughtn't they to have been concentering?