| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pron] [vb past] n't know [prep] | 7 |
|
| 2 | [Wh det] [pron] did n't know [prep] | 7 |
|
| 3 | [Wh det] [pers pn] [vb past] n't know [prep] | 7 |
|
