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