| singular | plural |
| Infinitive | | |
| prolong | |
| present simple | | |
| 1 | I prolong | we prolong |
| 2 | you prolong | you prolong |
| 3 | he/she/it prolongs | they prolong |
| past simple | | |
| 1 | I prolonged | we prolonged |
| 2 | you prolonged | you prolonged |
| 3 | he/she/it prolonged | they prolonged |
| future simple | | |
| 1 | I will/shall prolong | we will/shall prolong |
| 2 | you will/shall prolong | you will/shall prolong |
| 3 | he/she/it will/shall prolong | they will/shall prolong |
| conditional simple | | |
| 1 | I would prolong | we would prolong |
| 2 | you would prolong | you would prolong |
| 3 | he/she/it would prolong | they would prolong |
| present continuous | | |
| 1 | I am prolonging | we are prolonging |
| 2 | you are prolonging | you are prolonging |
| 3 | he/she/it is prolonging | they are prolonging |
| past continuous | | |
| 1 | I was prolonging | we were prolonging |
| 2 | you were prolonging | you were prolonging |
| 3 | he/she/it was prolonging | they were prolonging |
| future continuous | | |
| 1 | I will be prolonging | we will be prolonging |
| 2 | you will be prolonging | you will be prolonging |
| 3 | he/she/it will be prolonging | they will be prolonging |
| conditional continuous | | |
| 1 | I would be prolonging | we would be prolonging |
| 2 | you would be prolonging | you would be prolonging |
| 3 | he/she/it would be prolonging | they would be prolonging |
| present perfect | | |
| 1 | I have prolonged | we have prolonged |
| 2 | you have prolonged | you have prolonged |
| 3 | he/she/it has prolonged | they have prolonged |
| past perfect | | |
| 1 | I had prolonged | we had prolonged |
| 2 | you had prolonged | you had prolonged |
| 3 | he/she/it had prolonged | they had prolonged |
| future perfect | | |
| 1 | I will have prolonged | we will have prolonged |
| 2 | you will have prolonged | you will have prolonged |
| 3 | he/she/it will have prolonged | they will have prolonged |
| conditional perfect | | |
| 1 | I would have prolonged | we would have prolonged |
| 2 | you would have prolonged | you would have prolonged |
| 3 | he/she/it would have prolonged | they would have prolonged |
