| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it is [not/n't] [adv] | 828 |
|
| 2 | [conj] it is [adv] known | 112 |
|
| 3 | [conj] it is [not/n't] known | 41 |
|
| 4 | it is [not/n't] [adv] known | 40 |
|
