I ought to intervene you ought to intervene she ought to intervene we ought to intervene you ought to intervene they ought to intervene
V-ing form
I ought to be intervening you ought to be intervening she ought to be intervening we ought to be intervening you ought to be intervening they ought to be intervening
Perfect
I ought to have intervened you ought to have intervened she ought to have intervened we ought to have intervened you ought to have intervened they ought to have intervened
V-ing perfect
I ought to have been intervening you ought to have been intervening she ought to have been intervening we ought to have been intervening you ought to have been intervening they ought to have been intervening
Negation
Simple form
I ought not to intervene you ought not to intervene she ought not to intervene we ought not to intervene you ought not to intervene they ought not to intervene
V-ing form
I ought not to intervening you ought not to intervening she ought not to intervening we ought not to intervening you ought not to intervening they ought not to intervening
Perfect
I ought not to have intervened you ought not to have intervened she ought not to have intervened we ought not to have intervened you ought not to have intervened they ought not to have intervened
V-ing perfect
I ought not to have been intervening you ought not to have been intervening she ought not to have been intervening we ought not to have been intervening you ought not to have been intervening they ought not to have been intervening
Interrogative form
Simple form
ought to I intervene? ought to you intervene? ought to she intervene? ought to we intervene? ought to you intervene? ought to they intervene?
V-ing form
ought to I be intervening? ought to you be intervening? ought to she be intervening? ought to we be intervening? ought to you be intervening? ought to they be intervening?
Perfect
ought to I have intervened? ought to you have intervened? ought to she have intervened? ought to we have intervened? ought to you have intervened? ought to they have intervened?
V-ing perfect
ought to I have been intervening? ought to you have been intervening? ought to she have been intervening? ought to we have been intervening? ought to you have been intervening? ought to they have been intervening?
Interro-negative form
Simple form
ought I not to intervene? ought you not to intervene? ought she not to intervene? ought we not to intervene? ought you not to intervene? ought they not to intervene?
V-ing form
ought I not to be intervening? ought you not to be intervening? ought she not to be intervening? ought we not to be intervening? ought you not to be intervening? ought they not to be intervening?
Perfect
ought I not to have intervened? ought you not to have intervened? ought she not to have intervened? ought we not to have intervened? ought you not to have intervened? ought they not to have intervened?
V-ing perfect
ought I not to have been intervening? ought you not to have been intervening? ought she not to have been intervening? ought we not to have been intervening? ought you not to have been intervening? ought they not to have been intervening?