| Present "fail" | I | fail | |
| Present Continuous "fail" | I | am failing | |
| Simple past "fail" | I | failed | |
| Past Continuous "fail" | I | was failing | |
| Present perfect "fail" | I | have failed | |
| Present perfect continuous "fail" | I | have been failing | |
| Past perfect "fail" | I | had failed | |
| Past perfect continuous "fail" | I | had been failing | |
| Future "fail" | I | will fail | |
| Future continuous "fail" | I | will be failing | |
| Future perfect "fail" | I | will have failed | |
| Future perfect continuous "fail" | I | will have been failing |