| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] n't know at the time | 11 |
|
| 2 | do n't know at the time | 11 |
|
| 3 | did n't know at the time | 10 |
|
| 4 | [vb past] n't know at the time | 10 |
|
| 5 | n't know [pron] at the time | 7 |
|
| 6 | n't know [pers pn] at the time | 7 |
|
| 7 | n't know it at the time | 6 |
|
| 8 | n't know it at the time | 6 |
|
