| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] not [verb] | 10321 |
|
| 2 | [is] not [vb pp] | 6213 |
|
| 3 | [is] [adv] known | 1549 |
|
| 4 | [be] not known | 576 |
|
| 5 | [is] not know | 424 |
|
| 6 | [is] [not/n't] known | 416 |
|
| 7 | [is] not known | 416 |
|
