| Present "guarantee" | I | guarantee | |
| Present Continuous "guarantee" | I | am guaranteeing | |
| Simple past "guarantee" | I | guaranteed | |
| Past Continuous "guarantee" | I | was guaranteeing | |
| Present perfect "guarantee" | I | have guaranteed | |
| Present perfect continuous "guarantee" | I | have been guaranteeing | |
| Past perfect "guarantee" | I | had guaranteed | |
| Past perfect continuous "guarantee" | I | had been guaranteeing | |
| Future "guarantee" | I | will guarantee | |
| Future continuous "guarantee" | I | will be guaranteeing | |
| Future perfect "guarantee" | I | will have guaranteed | |
| Future perfect continuous "guarantee" | I | will have been guaranteeing |