| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] not know at the time | 12 |
|
| 2 | [vb past] [not/n't] know at the time | 12 |
|
| 3 | [vb past] [adv] know at the time | 12 |
|
| 4 | [vb past] [adv] know at the time | 12 |
|
| 5 | [vb past] [adv] know at the time | 11 |
|
| 6 | did [adv] know at the time | 11 |
|
| 7 | [vb past] n't know at the time | 10 |
|
