| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] know [pers pn] at the time | 13 |
|
| 2 | [not/n't] know it [prep] the time | 12 |
|
| 3 | n't know [pers pn] [prep] the time | 7 |
|
| 4 | not know [pers pn] [prep] the time | 6 |
|
