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