| Present "back" | I | back | |
| Present Continuous "back" | I | am backing | |
| Simple past "back" | I | backed | |
| Past Continuous "back" | I | was backing | |
| Present perfect "back" | I | have backed | |
| Present perfect continuous "back" | I | have been backing | |
| Past perfect "back" | I | had backed | |
| Past perfect continuous "back" | I | had been backing | |
| Future "back" | I | will back | |
| Future continuous "back" | I | will be backing | |
| Future perfect "back" | I | will have backed | |
| Future perfect continuous "back" | I | will have been backing |