ought to concentrate
Verbo regular: concentrate - concentrated- concentrated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I ought to concentrate
you ought to concentrate
he ought to concentrate
we ought to concentrate
you ought to concentrate
they ought to concentrate 	I ought to be concentrating
you ought to be concentrating
he ought to be concentrating
we ought to be concentrating
you ought to be concentrating
they ought to be concentrating	I ought to have concentrated
you ought to have concentrated
he ought to have concentrated
we ought to have concentrated
you ought to have concentrated
they ought to have concentrated	I ought to have been concentrating
you ought to have been concentrating
he ought to have been concentrating
we ought to have been concentrating
you ought to have been concentrating
they ought to have been concentrating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I oughtn't to concentrate
you oughtn't to concentrate
he oughtn't to concentrate
we oughtn't to concentrate
you oughtn't to concentrate
they oughtn't to concentrate 	I oughtn't to be concentrating
you oughtn't to be concentrating
he oughtn't to be concentrating
we oughtn't to be concentrating
you oughtn't to be concentrating
they oughtn't to be concentrating	I oughtn't to have concentrated
you oughtn't to have concentrated
he oughtn't to have concentrated
we oughtn't to have concentrated
you oughtn't to have concentrated
they oughtn't to have concentrated	I oughtn't to have been concentrating
you oughtn't to have been concentrating
he oughtn't to have been concentrating
we oughtn't to have been concentrating
you oughtn't to have been concentrating
they oughtn't to have been concentrating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
ought to I concentrate?
ought to you concentrate?
ought to he concentrate?
ought to we concentrate?
ought to you concentrate?
ought to they concentrate? 	ought to I be concentrating?
ought to you be concentrating?
ought to he be concentrating?
ought to we be concentrating?
ought to you be concentrating?
ought to they be concentrating? 	ought to I have concentrated?
ought to you have concentrated?
ought to he have concentrated?
ought to we have concentrated?
ought to you have concentrated?
ought to they have concentrated? 	ought to I have been concentrating?
ought to you have been concentrating?
ought to he have been concentrating?
ought to we have been concentrating?
ought to you have been concentrating?
ought to they have been concentrating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
oughtn't I to concentrate?
oughtn't you to concentrate?
oughtn't he to concentrate?
oughtn't we to concentrate?
oughtn't you to concentrate?
oughtn't they to concentrate? 	oughtn't I to be concentrating?
oughtn't you to be concentrating?
oughtn't he to be concentrating?
oughtn't we to be concentrating?
oughtn't you to be concentrating?
oughtn't they to be concentrating? 	oughtn't I to have concentrated?
oughtn't you to have concentrated?
oughtn't he to have concentrated?
oughtn't we to have concentrated?
oughtn't you to have concentrated?
oughtn't they to have concentrated? 	oughtn't I to have been concentrating?
oughtn't you to have been concentrating?
oughtn't he to have been concentrating?
oughtn't we to have been concentrating?
oughtn't you to have been concentrating?
oughtn't they to have been concentrating?