| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | do [not/n't] know at the | 20 |
|
| 2 | [verb] n't know at the | 17 |
|
| 3 | did [not/n't] know at the | 12 |
|
| 4 | [vb past] [not/n't] know at the | 12 |
|
| 5 | do [not/n't] know at the | 6 |
|
| 6 | [vb base] [not/n't] know at the | 6 |
|
