I ought to understand you ought to understand he ought to understand we ought to understand you ought to understand they ought to understand
V-ing form
I ought to be understanding you ought to be understanding he ought to be understanding we ought to be understanding you ought to be understanding they ought to be understanding
Perfect
I ought to have understood you ought to have understood he ought to have understood we ought to have understood you ought to have understood they ought to have understood
V-ing perfect
I ought to have been understanding you ought to have been understanding he ought to have been understanding we ought to have been understanding you ought to have been understanding they ought to have been understanding
Negation
Simple form
I oughtn't to understand you oughtn't to understand he oughtn't to understand we oughtn't to understand you oughtn't to understand they oughtn't to understand
V-ing form
I oughtn't to be understanding you oughtn't to be understanding he oughtn't to be understanding we oughtn't to be understanding you oughtn't to be understanding they oughtn't to be understanding
Perfect
I oughtn't to have understood you oughtn't to have understood he oughtn't to have understood we oughtn't to have understood you oughtn't to have understood they oughtn't to have understood
V-ing perfect
I oughtn't to have been understanding you oughtn't to have been understanding he oughtn't to have been understanding we oughtn't to have been understanding you oughtn't to have been understanding they oughtn't to have been understanding
Interrogative form
Simple form
ought to I understand? ought to you understand? ought to he understand? ought to we understand? ought to you understand? ought to they understand?
V-ing form
ought to I be understanding? ought to you be understanding? ought to he be understanding? ought to we be understanding? ought to you be understanding? ought to they be understanding?
Perfect
ought to I have understood? ought to you have understood? ought to he have understood? ought to we have understood? ought to you have understood? ought to they have understood?
V-ing perfect
ought to I have been understanding? ought to you have been understanding? ought to he have been understanding? ought to we have been understanding? ought to you have been understanding? ought to they have been understanding?
Interro-negative form
Simple form
oughtn't I to understand? oughtn't you to understand? oughtn't he to understand? oughtn't we to understand? oughtn't you to understand? oughtn't they to understand?
V-ing form
oughtn't I to be understanding? oughtn't you to be understanding? oughtn't he to be understanding? oughtn't we to be understanding? oughtn't you to be understanding? oughtn't they to be understanding?
Perfect
oughtn't I to have understood? oughtn't you to have understood? oughtn't he to have understood? oughtn't we to have understood? oughtn't you to have understood? oughtn't they to have understood?
V-ing perfect
oughtn't I to have been understanding? oughtn't you to have been understanding? oughtn't he to have been understanding? oughtn't we to have been understanding? oughtn't you to have been understanding? oughtn't they to have been understanding?