| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not know it at | 16 |
|
| 2 | [not/n't] know it at | 16 |
|
| 3 | [adv] know it at | 16 |
|
| 4 | [adv] know it at | 16 |
|
| 5 | n't know it at | 9 |
|
| 6 | not know it at | 7 |
|
