I'll back you'll back he'll back we'll back you'll back they'll back
V-ing form
I'll be backing you'll be backing he'll be backing we'll be backing you'll be backing they'll be backing
Perfect
I'll have backed you'll have backed he'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 he'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 he 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 he 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 he 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 he 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 he back? shall we back? shall you back? shall they back?
V-ing form
shall I be backing? shall you be backing? shall he be backing? shall we be backing? shall you be backing? shall they be backing?
Perfect
shall I have backed? shall you have backed? shall he 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 he 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 he 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 he 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 he 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 he have been backing? shan't we have been backing? shan't you have been backing? shan't they have been backing?