| I | stumble |
|---|---|
| you | stumble |
| he/she/it | stumbles |
| we | stumble |
| you | stumble |
| they | stumble |
| I | stumbled |
|---|---|
| you | stumbled |
| he/she/it | stumbled |
| we | stumbled |
| you | stumbled |
| they | stumbled |
| I | have | stumbled |
|---|---|---|
| you | have | stumbled |
| he/she/it | has | stumbled |
| we | have | stumbled |
| you | have | stumbled |
| they | have | stumbled |
| I | had | stumbled |
|---|---|---|
| you | had | stumbled |
| he/she/it | had | stumbled |
| we | had | stumbled |
| you | had | stumbled |
| they | had | stumbled |
单语范例（未经PONS编辑处理）
In doing so, numerous enemy vehicles stumbled into the 37th's position and were captured or destroyed.
en.wikipedia.org However, in his quest, he stumbles on a community governed by a bureaucratic hierarchy using the dragon to cover their own use of power.
en.wikipedia.org They have a variety of adventures before stumbling upon a gold deposit.
en.wikipedia.org Leo is the creator of a booming gaming website, and has stumbled into a world of money and big decisions.
en.wikipedia.org The professor stumbles on-stage at several points, amusing the audience who think it to be part of the act.
en.wikipedia.org