I ought to observe you ought to observe she ought to observe we ought to observe you ought to observe they ought to observe
V-ing form
I ought to be observing you ought to be observing she ought to be observing we ought to be observing you ought to be observing they ought to be observing
Perfect
I ought to have observed you ought to have observed she ought to have observed we ought to have observed you ought to have observed they ought to have observed
V-ing perfect
I ought to have been observing you ought to have been observing she ought to have been observing we ought to have been observing you ought to have been observing they ought to have been observing
Negation
Simple form
I ought not to observe you ought not to observe she ought not to observe we ought not to observe you ought not to observe they ought not to observe
V-ing form
I ought not to observing you ought not to observing she ought not to observing we ought not to observing you ought not to observing they ought not to observing
Perfect
I ought not to have observed you ought not to have observed she ought not to have observed we ought not to have observed you ought not to have observed they ought not to have observed
V-ing perfect
I ought not to have been observing you ought not to have been observing she ought not to have been observing we ought not to have been observing you ought not to have been observing they ought not to have been observing
Interrogative form
Simple form
ought to I observe? ought to you observe? ought to she observe? ought to we observe? ought to you observe? ought to they observe?
V-ing form
ought to I be observing? ought to you be observing? ought to she be observing? ought to we be observing? ought to you be observing? ought to they be observing?
Perfect
ought to I have observed? ought to you have observed? ought to she have observed? ought to we have observed? ought to you have observed? ought to they have observed?
V-ing perfect
ought to I have been observing? ought to you have been observing? ought to she have been observing? ought to we have been observing? ought to you have been observing? ought to they have been observing?
Interro-negative form
Simple form
ought I not to observe? ought you not to observe? ought she not to observe? ought we not to observe? ought you not to observe? ought they not to observe?
V-ing form
ought I not to be observing? ought you not to be observing? ought she not to be observing? ought we not to be observing? ought you not to be observing? ought they not to be observing?
Perfect
ought I not to have observed? ought you not to have observed? ought she not to have observed? ought we not to have observed? ought you not to have observed? ought they not to have observed?
V-ing perfect
ought I not to have been observing? ought you not to have been observing? ought she not to have been observing? ought we not to have been observing? ought you not to have been observing? ought they not to have been observing?