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