| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not know [pron] at the time | 13 |
|
| 2 | not know [pers pn] at the time | 13 |
|
| 3 | not know it at the time | 12 |
|
| 4 | not know it at the time | 12 |
|
| 5 | n't know [pron] at the time | 7 |
|
| 6 | not know [pron] at the time | 6 |
|
