| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] not know at the [noun sg] | 13 |
|
| 2 | [vb past] not know at the time | 12 |
|
| 3 | [vb past] not know at the [noun] | 12 |
|
| 4 | did not know at the [noun] | 12 |
|
| 5 | [vb past] not know at the time | 12 |
|
| 6 | [vb past] n't know at the [noun] | 10 |
|
