
Verbo regular: back - backed - backed
Forma simple | Forma con V-ing | 
| I'll back you'll back she'll back we'll back you'll back they'll back  | I'll be backing you'll be backing she'll be backing we'll be backing you'll be backing they'll be backing  | 
Perfecto | Perfecto con V-ing | 
| I'll have backed you'll have backed she'll have backed we'll have backed you'll have backed they'll have backed  | 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  | 
Forma simple | Forma con V-ing | 
| I shan't back you shan't back she shan't back we shan't back you shan't back they shan't back  | 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  | 
Perfecto | Perfecto con V-ing | 
| 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  | 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  | 
Forma simple | Forma con V-ing | 
| shall I back? shall you back? shall she back? shall we back? shall you back? shall they back?  | shall I be backing? shall you be backing? shall she be backing? shall we be backing? shall you be backing? shall they be backing?  | 
Perfecto | Perfecto con V-ing | 
| shall I have backed? shall you have backed? shall she have backed? shall we have backed? shall you have backed? shall they have backed?  | 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?  | 
Forma simple | Forma con V-ing | 
| shan't I back? shan't you back? shan't she back? shan't we back? shan't you back? shan't they back?  | 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?  | 
Perfecto | Perfecto con V-ing | 
| 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?  | 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?  |