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