| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] not know [adv] when | 7 |
|
| 2 | [verb] [adv] know [adv] when | 7 |
|
| 3 | [verb] [not/n't] know [adv] when | 7 |
|
| 4 | [verb] n't know [adv] when | 5 |
|
