
Regular verb: back - backed - backed
| Present | Present continuous | Preterite | Preterite continuous | 
| do I back? do you back? does he back? do we back? do you back? do they back? | am I backing? are you backing? is he backing? are we backing? are you backing? are they backing? | did I back? did you back? did he back? did we back? did you back? did they back? | was I backing? were you backing? was he backing? were we backing? were you backing? were they backing? | 
| Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| have I backed? have you backed? has he backed? have we backed? have you backed? have they backed? | have I been backing? have you been backing? has he been backing? have we been backing? have you been backing? have they been backing? | had I backed? had you backed? had he backed? had we backed? had you backed? had they backed? | had I been backing? had you been backing? had he been backing? had we been backing? had you been backing? had they been backing? | 
| Future | Future continuous | Future perfect | Future perfect continuous | 
| will I back? will you back? will he back? will we back? will you back? will they back? | will I be backing? will you be backing? will he be backing? will we be backing? will you be backing? will they be backing? | will I have backed? will you have backed? will he have backed? will we have backed? will you have backed? will they have backed? | will I have been backing? will you have been backing? will he have been backing? will we have been backing? will you have been backing? will they have been backing? | 
| Present | Present continuous | Past | Past continuous | 
| would I back? would you back? would he back? would we back? would you back? would they back? | would I be backing? would you be backing? would he be backing? would we be backing? would you be backing? would they be backing? | would I have backed? would you have backed? would he have backed? would we have backed? would you have backed? would they have backed? | would I have been backing? would you have been backing? would he have been backing? would we have been backing? would you have been backing? would they have been backing? | 
| Infinitive | Imperative | 
| Infinitive | Imperative | ||
| to back | - - - | 
| Present | Past | ||
| backing | backed |