| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | n't know [pers pn] at [art] time | 7 |
|
| 2 | n't know [pron] at the time | 7 |
|
| 3 | n't know it at [art] time | 6 |
|
| 4 | n't know it at [art] time | 6 |
|
