| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] n't know | 4058 |
|
| 2 | n't know [prep] | 792 |
|
| 3 | [vb past] know [prep] | 664 |
|
| 4 | [vb past] n't [prep] | 127 |
|
