| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | did n't know [noun] | 89 |
|
| 2 | [vb past] n't know [noun prp] | 63 |
|
| 3 | [vb past] n't know [noun sg] | 17 |
|
| 4 | [vb past] n't know [noun pl] | 7 |
|
