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