| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [verb] [prep] | 34971 |
|
| 2 | not [vb pp] [prep] | 12577 |
|
| 3 | [adv] known [prep] | 3241 |
|
| 4 | not know [prep] | 424 |
|
| 5 | [not/n't] known [prep] | 229 |
|
| 6 | not known [prep] | 229 |
|
