| Present "approximate" | I | approximate | |
| Present Continuous "approximate" | I | am approximating | |
| Simple past "approximate" | I | approximated | |
| Past Continuous "approximate" | I | was approximating | |
| Present perfect "approximate" | I | have approximated | |
| Present perfect continuous "approximate" | I | have been approximating | |
| Past perfect "approximate" | I | had approximated | |
| Past perfect continuous "approximate" | I | had been approximating | |
| Future "approximate" | I | will approximate | |
| Future continuous "approximate" | I | will be approximating | |
| Future perfect "approximate" | I | will have approximated | |
| Future perfect continuous "approximate" | I | will have been approximating |