| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know at the time | 15 |
|
| 2 | [adv] know at the time | 15 |
|
| 3 | not know at the time | 14 |
|
| 4 | [not/n't] know at the time | 14 |
|
| 5 | n't know at the time | 12 |
|
