I ought to understand you ought to understand she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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?