| I | doubt |
|---|---|
| you | doubt |
| he/she/it | doubts |
| we | doubt |
| you | doubt |
| they | doubt |
| I | doubted |
|---|---|
| you | doubted |
| he/she/it | doubted |
| we | doubted |
| you | doubted |
| they | doubted |
| I | have | doubted |
|---|---|---|
| you | have | doubted |
| he/she/it | has | doubted |
| we | have | doubted |
| you | have | doubted |
| they | have | doubted |
| I | had | doubted |
|---|---|---|
| you | had | doubted |
| he/she/it | had | doubted |
| we | had | doubted |
| you | had | doubted |
| they | had | doubted |
单语范例（未经PONS编辑处理）
How nice that he was so enamored of the work he was doing, which no doubt contirbuted to the success of the project.
voices.nationalgeographic.com Still, curiosity will no doubt impel me to plunk down $4 for this.
robot6.comicbookresources.com His self-doubt and feelings of personal inadequacy revealed over the seven weeks made him appear even more vulnerable than those he was treating.
en.wikipedia.org To test the doubt was dramatically a chance not to be missed, not be bungled either by resolving it.
en.wikipedia.org The second opinion, which seems to have been the most popular one with the ancient writers, arose without doubt from a false etymology.
en.wikipedia.org