I'll back you'll back she'll back we'll back you'll back they'll back
V-ing form
I'll be backing you'll be backing she'll be backing we'll be backing you'll be backing they'll be backing
Perfect
I'll have backed you'll have backed she'll have backed we'll have backed you'll have backed they'll have backed
V-ing perfect
I'll have been backing you'll have been backing she'll have been backing we'll have been backing you'll have been backing they'll have been backing
Negation
Simple form
I shan't back you shan't back she shan't back we shan't back you shan't back they shan't back
V-ing form
I shan't be backing you shan't be backing she shan't be backing we shan't be backing you shan't be backing they shan't be backing
Perfect
I shan't have backed you shan't have backed she shan't have backed we shan't have backed you shan't have backed they shan't have backed
V-ing perfect
I shan't have been backing you shan't have been backing she shan't have been backing we shan't have been backing you shan't have been backing they shan't have been backing
Interrogative form
Simple form
shall I back? shall you back? shall she back? shall we back? shall you back? shall they back?
V-ing form
shall I be backing? shall you be backing? shall she be backing? shall we be backing? shall you be backing? shall they be backing?
Perfect
shall I have backed? shall you have backed? shall she have backed? shall we have backed? shall you have backed? shall they have backed?
V-ing perfect
shall I have been backing? shall you have been backing? shall she have been backing? shall we have been backing? shall you have been backing? shall they have been backing?
Interro-negative form
Simple form
shan't I back? shan't you back? shan't she back? shan't we back? shan't you back? shan't they back?
V-ing form
shan't I be backing? shan't you be backing? shan't she be backing? shan't we be backing? shan't you be backing? shan't they be backing?
Perfect
shan't I have backed? shan't you have backed? shan't she have backed? shan't we have backed? shan't you have backed? shan't they have backed?
V-ing perfect
shan't I have been backing? shan't you have been backing? shan't she have been backing? shan't we have been backing? shan't you have been backing? shan't they have been backing?